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Filed pursuant to Rule 424(b)(4)
Registration No. 333-178030

7,150,000 Shares

Class A Common Stock

This is an initial public offering of shares of Class A common stock of Yelp Inc.

Yelp is offering 7,100,000 of the shares to be sold in the offering. The selling stockholder identified in this prospectus is offering an additional 50,000 shares. Yelp will not receive any of the proceeds from the sale of the shares being sold by the selling stockholder.

Following this offering, we will have two classes of authorized common stock, Class A common stock and Class B common stock. The rights of the holders of Class A common stock and Class B common stock will be identical, except with respect to voting and conversion. Each share of Class A common stock will be entitled to one vote per share. Each share of Class B common stock will be entitled to ten votes per share and will be convertible at any time into one share of Class A common stock. Outstanding shares of Class B common stock will represent approximately 98.7% of the voting power of our outstanding capital stock immediately following this offering.

Prior to this offering, there has been no public market for the Class A common stock. The initial public offering price per share is $15.00. Our Class A common stock has been approved for listing on the New York Stock Exchange under the symbol “YELP”.

See “Risk Factors” beginning on page 16 to read about factors you should consider before buying shares of the Class A common stock.

Neither the Securities and Exchange Commission nor any other regulatory body has approved or disapproved of these securities or passed upon the accuracy or adequacy of this prospectus. Any recommendation to the contrary is a criminal offense.

To the extent that the underwriters sell more than 7,150,000 shares of Class A common stock, the underwriters have the option to purchase up to an additional 1,072,500 shares from Yelp at the initial public offering price less the underwriting discount.

The underwriters expect to deliver the shares against payment in New York, New York on March 7, 2012.

Jefferies

Prospectus dated March 1, 2012

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Thanks to Yelp,

I HAVE WRITTEN

More in

five months than my

FOUR YEARS IN

high school.

You know you’re on

Your way

when your

name is now

A VERB.

How can

anyone

not love

YELP?

Yelp has

totally

reinvented my

SOCIAL LIFE.

Do you

REMEMBER

life before

yelp

I sure don’t...

It’s awesome.

I mean it.

I’m holding

A LIT SPARKLER

right now. Source: user reviews of Yelp

yelp

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BECAUSE COMMUNITY MATTERS:

Yelp connects people with great local businesses on an international scale.

Most reviewed outdoor market in London

BOROUGH MARKET

216 reviews

Most reviewed public bathroom on Yelp

CHARMIN RESTROOMS

26 reviews

Most reviewed business on Yelp

BI-RITE CREAMERY

4,218 reviews Most reviewed plumber in Texas

UNION JACK PLUMBING

Most mobile Check-Ins per zip code

LAS VEGAS, 89109 70 reviews Most reviewed currywurst in

CURRY 36

What happens in Vegas gets

Most reviewed mechanic in Illinois reviewed on Yelp.

ASHLAND TIRE & AUTO 25 reviews

258 reviews Most recently formed Yelp Elite

= Yelp Market with Community Manager before 2011 Squad of reviewers

MADRID, SPAIN

= Yelp Market with Community Manager launched in 2011 Source: Yelp review database as of September 30th,

“Yelp’s impact is huge. When we first opened,

“Since I can’t be “Yelp is really critical in marketing and on an obscure corner, not a lot of people everywhere and “I have a dangerous running a restaurant properly. Every knew about us. We started gaining positive

do everything, addiction: Yelp. I single review is an educational

Yelp helps me Yelp reviews and they impacted our get up in the middle tool. If you’re keep track of business in a of the night to write not using Yelp, my city and big way.” reviews and edit my you’re missing out.” choose how to profile. Even my

- JULIE L spend my four-year-old kid has - CHARLES T

OC Wine Mart,

Roka Akor Sushi, time and money wisely.” Irvine, CA uttered, ‘You should yelp this.’” Chicago IL

- MICHAEL S - HEATHER N Yelper, Denver, CO Yelper, Decatur, GA

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22 MILLION

reviews

25 20 15 10 5

0

Q4 ‘05 Q4 ‘06 Q4 ‘07 Q4 ‘08 Q4 ‘09 Q4 ‘10 Q3 ‘11

Cumulative reviews contributed since inception

61 MILLION

monthy unique visitors

60 50 40 30 20 10

0

Q4 ‘05 Q4 ‘06 Q4 ‘07 Q4 ‘08 Q4 ‘09 Q4 ‘10 Q3 ‘11

Average monthly unique visitors for the quarter

529 THOUSAND

claimed local business locations

500 400 300 200 100

0

Q4 ‘05 Q4 ‘06 Q4 ‘07 Q4 ‘08 Q4 ‘09 Q4 ‘10 Q3 ‘11

Cumulative claimed local business locations since inception

ALMOST EVERY SECOND

a consumer looks up directions to or calls a local business from a Yelp mobile app.

Average for Q3 2011

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We have not authorized anyone to give any information or to make any representations other than those contained in this prospectus or in any free writing prospectuses we have prepared. We take no responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you. This prospectus is an offer to sell only the shares offered hereby, and only under circumstances and in jurisdictions where it is lawful to do so. The information contained in this prospectus is current only as of its date.

Unless the context otherwise indicates, where we refer in this prospectus to our “mobile application” or “mobile app”, we refer to all of our applications for mobile-enabled devices. Similarly, references to our “website” refer to both the U.S. and international versions of our website.

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RISK FACTORS

Investing in our Class A common stock involves a high degree of risk. You should carefully consider the risks and uncertainties described below, together with all of the other information in this prospectus, including “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our consolidated financial statements and related notes, before deciding whether to purchase shares of our Class A common stock. Any of the following risks could materially and adversely affect our business, financial condition, results of operations or prospects, and cause the value of our Class A common stock to decline, which could cause you to lose all or part of your investment.

Risks Related to Our Business and Industry

We have a short operating history in an evolving industry, which makes it difficult to evaluate our future prospects and may increase the risk that we will not be successful.

We have a short operating history in an evolving industry that may not develop as expected, if at all. This short operating history makes it difficult to assess our future prospects. You should consider our business and prospects in light of the risks and difficulties we may encounter in this rapidly evolving industry. These risks and difficulties include our ability to, among other things:

If the demand for information regarding local businesses does not develop as we expect, or if we fail to address the needs of this demand, our business will be harmed. We may not be able to successfully address these risks and difficulties or others, including those described elsewhere in these risk factors. Failure to adequately address these risks and difficulties could harm our business and cause our operating results to suffer.

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We have incurred significant operating losses in the past, and we may not be able to generate sufficient revenue to achieve or maintain profitability, particularly given our significant ongoing sales and marketing expenses. Our recent growth rate will likely not be sustainable, and a failure to maintain an adequate growth rate will adversely affect our results of operations and business.

Since our inception, we have incurred significant operating losses, and, as of December 31, 2011, we had an accumulated deficit of approximately $41.2 million. Although our revenues have grown rapidly, increasing from $12.1 million in 2008, to $83.3 million in 2011, we expect that our revenue growth rate will decline in the future as a result of a variety of factors, including the maturation of our business and the gradual decline in the number of major geographic markets, especially within the United States, to which we have not already expanded, and you should not rely on the revenue growth of any prior quarterly or annual period as an indication of our future performance. We also expect our costs to increase in future periods as we continue to expend substantial financial resources on:

These investments may not result in increased revenue or growth in our business. If we are unable to maintain adequate revenue growth and to manage our expenses, we may continue to incur significant losses in the future and may not be able to achieve or maintain profitability.

We rely on traffic to our website from search engines like Google, Yahoo! and Bing, some of which offer products and services that compete directly with our solutions. If our website fails to rank prominently in unpaid search results, traffic to our website could decline and our business would be adversely affected.

Our success depends in part on our ability to attract users through unpaid Internet search results on search engines like Google, Yahoo! and Bing. The number of users we attract to our website from search engines is due in large part to how and where our website ranks in unpaid search results. These rankings can be affected by a number of factors, many of which are not in our direct control, and they may change frequently. For example, a search engine may change its ranking algorithms, methodologies or design layouts. As a result, links to our website may not be prominent enough to drive traffic to our website, and we may not know how or otherwise be in a position to influence the results. In some instances, search engine companies may change these rankings in order to promote their own competing products or services or the products or services of one or more of our competitors. Our website has experienced fluctuations in search result rankings in the past, and we anticipate fluctuations in the future. Any reduction in the number of users directed to our website could adversely impact our business and results of operations.

Google in particular is the most significant source of traffic to our website accounting for more than half of the visits to our website from Internet searches during the year ended December 31, 2011. Our success depends on our ability to maintain a prominent presence in search results for queries regarding local businesses on Google. Google has removed links to our website from portions of its web search product, and has promoted its own competing products, including Google’s local products,

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in its search results. Given the large volume of traffic to our website and the importance of the placement and display of results of a user’s search, similar actions in the future could have a substantial negative effect on our business and results of operations.

If we fail to generate and maintain sufficient high quality content from our users, we will be unable to provide consumers with the information they are looking for, which could negatively impact our traffic and revenue.

Our success depends on our ability to provide consumers with the information they seek, which in turn depends on the quantity and quality of the content provided by our users. For example, we may be unable to provide consumers with the information they seek if our users do not contribute content that is helpful and reliable, or if they remove content they previously submitted. Similarly, we may be unable to provide consumers with the information they seek if our users are unwilling to contribute content because of concerns that they may be harassed or sued by the businesses they review, instances of which have occurred in the past and may occur again in the future. In addition, we may not be able to provide users the information they seek if the information on our platform is not up-to-date. We do not phase out or remove dated reviews, and consumers may view older reviews as less relevant, helpful or reliable. If our platform does not provide current information about local businesses or users perceive reviews on our platform as less relevant, our brand and our business could be harmed.

If we are unable to provide consumers with the information they seek, or if they can find equivalent content on other services, they may stop or reduce their use of our platform, and traffic to our website and on our mobile app will decline. If our user traffic declines, our advertisers may stop or reduce the amount of advertising on our platform and our business could be harmed.

Our business may be harmed if users view our platform as primarily limited to reviews of restaurants and shopping experiences.

Our user traffic could be adversely affected if consumers perceive the utility of our platform to be limited to finding businesses in the restaurant and shopping categories, which together accounted for approximately 45% of the businesses that have been reviewed on our platform and 62% of our cumulative reviews through December 31, 2011. We believe that this concentration of reviews is primarily due to the frequency with which individuals visit specific businesses or engage in certain activities versus others. For example, an individual may eat at a restaurant three times in one week or go shopping once a week, but the same individual is unlikely to visit a mechanic, get a haircut or use a home or local service with the same frequency. However, if the high concentration of reviews in the restaurant and shopping categories generates a perception that our platform is primarily limited to these categories, traffic may decline and advertising customers may be less likely to perceive value from using our services, which could harm our business.

If our technology filters helpful content or fails to filter unhelpful content, consumers and businesses alike may stop or reduce their use of our platform and products, and our business could suffer.

While we have designed our technology to filter content that we believe may be offensive, biased, unreliable or otherwise unhelpful, we cannot guarantee that our efforts will be effective or adequate. In addition, some consumers and businesses have expressed concern that our technology inappropriately filters legitimate reviews, which may cause them to stop or reduce their use of our platform or our advertising solutions. If the performance of our filter proves inadequate or ineffective, our reputation and brand may be harmed, users may stop using our products and our business and results of operations could be adversely affected.

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Our business depends on a strong brand, and any failure to maintain, protect and enhance our brand would hurt our ability to retain or expand our base of users and advertisers, or our ability to increase the frequency with which they use our solutions.

We have developed a strong brand that we believe has contributed significantly to the success of our business. Maintaining, protecting and enhancing the “Yelp” brand is critical to expanding our base of users and advertisers and increasing the frequency with which they use our solutions, and will depend largely on our ability to maintain consumer trust in our solutions and in the quality and integrity of the user content and other information found on our website and mobile app, which we may not do successfully. If we do not successfully maintain a strong brand, our business could be harmed.

For example, consumers may believe that the reviews, photos and other content contributed by our Community Managers or other employees are influenced by our advertising relationships or are otherwise biased. Although we take steps to prevent this from occurring by, for example, displaying an “ambassador” badge on the account profile pages for each of our Community Managers identifying them as Yelp employees and explaining their role on our platform, the designation does not appear on the page for each review contributed by the Community Manager and we may not be successful in our efforts to maintain consumer trust. As a result, our brand and our business could be harmed.

Our trademarks are an important element of our brand. We have faced in the past, and may face in the future, oppositions from third parties to our applications to register key trademarks in foreign jurisdictions in which we expect to expand our presence. If we are unsuccessful in defending against these oppositions, our trademark applications may be denied. Whether or not our trademark registration applications are denied, third parties may claim that our trademarks infringe their rights. As a result, we could be forced to pay significant settlement costs or cease the use of these trademarks and associated elements of our brand in those or other jurisdictions. Doing so could harm our brand or brand recognition and adversely affect our business, financial condition and results of operation.

Negative publicity could adversely affect our reputation and brand.

Negative publicity about our company, including our technology, sales practices, personnel or customer service, could diminish confidence in and the use of our products. The media has previously reported allegations that we manipulate our reviews, rankings and ratings in favor of our advertisers and against non-advertisers. In order to demonstrate that our filtering process applies in a non-discriminatory manner to both advertisers and non-advertisers, we have made all filtered reviews accessible on our platform. We have also allowed businesses to publicly comment on negative reviews so that they can provide their response. Nevertheless, our reputation and brand, the traffic to our website and mobile app and our business may suffer if negative publicity about our company persists or if users otherwise perceive that content on our website and mobile app is manipulated or biased. In addition, our website and mobile app serve as a platform for expression by our users, and third parties or the public at large may attribute the political or other sentiments expressed by users on our platform to us, which could harm our reputation.

If we fail to maintain and expand our base of advertisers, our revenue and our business will be harmed.

In the year ended December 31, 2011, substantially all of our revenue was generated by the sale of advertising products. Our ability to grow our business depends on our ability to maintain and expand our advertiser base. To do so, we must convince prospective advertisers of the benefits of our products, including those who may not be familiar with our products (such as those in new markets). In addition, we have incurred significant costs to attract current and future advertisers and expect to incur significant additional costs for the foreseeable future. We may face greater challenges as we continue

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to expand our advertiser base in businesses outside the restaurant and shopping categories, which together accounted for approximately 45% of the businesses that have been reviewed on our platform and 62% of our cumulative reviews through December 31, 2011, especially if these businesses believe that consumers perceive the utility of our platform to be limited to finding businesses in the restaurant and shopping categories. We must also convince existing and prospective advertisers alike that our advertising products work to their benefit. Many of these businesses are more accustomed to using more traditional methods of advertising, such as newspapers or print yellow pages directories. Failure to maintain and expand the advertiser base could harm our business.

Our advertisers do not typically have long-term obligations to purchase our products. In addition, we rely heavily on advertising spend by small and medium-sized local businesses, which have historically experienced high failure rates and often have limited advertising budgets. As a result, we may experience attrition in our advertisers in the ordinary course of business resulting from several factors, including losses to competitors, lower priced competitors, perceptions that our advertising solutions are unnecessary or ineffective, declining advertising budgets, closures and bankruptcies. We must continually add new advertisers both to replace advertisers who choose not to renew their advertising or who go out of business, or otherwise fail to fulfill their advertising contracts with us, and to grow our business. Our advertisers’ decisions to renew depend on a number of factors, including the degree of satisfaction with our products and their ability to continue their operations and spending levels. The ratings and reviews that businesses receive from our users may also affect advertising decisions by current and prospective advertisers. For instance, favorable ratings and reviews, on the one hand, could be perceived as obviating the need to advertise, and unfavorable ratings and reviews, on the other, could discourage businesses from advertising to an audience they perceive as hostile or cause them to form a negative opinion of our products and user base which could discourage them from doing business with us. If our advertisers increase their rates of non-renewal or if we experience significant advertiser attrition or contract breach, or if we are unable to attract new advertisers in numbers greater than the number of advertisers that we lose, our client base will decrease and our business, financial condition and results of operations would be harmed.

If we fail to expand effectively into new markets, both domestically and abroad, our revenue and our business will be harmed.

We intend to expand our operations into new markets, both domestically and abroad. We may incur losses or otherwise fail to enter new markets successfully. Our expansion into new markets places us in competitive environments with which we are unfamiliar and involves various risks, including the need to invest significant resources and the possibility that returns on such investments will not be achieved for several years, or at all. In attempting to establish a presence in new markets, we expect, as we have in the past, to incur significant expenses and face various other challenges, such as expanding our sales force and community management personnel to cover those new markets. Our current and any future expansion plans will require significant resources and management attention. Furthermore, we have already entered many of the largest markets in the United States and further expansion in smaller markets may not yield similar results or sustain our growth.

Our international operations involve additional risks, and our exposure to these risks will increase as we expand internationally.

We have started to expand our operations internationally. We expect to expand our international operations significantly by accessing new markets abroad and expanding our offerings in new languages. Our platform is now available in English and several other languages. However, we may have difficulty modifying our technology and content for use in non-English-speaking markets or fostering new communities in non-English-speaking markets. Our ability to manage our business and

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conduct our operations internationally requires considerable management attention and resources, and is subject to the particular challenges of supporting a rapidly growing business in an environment of multiple languages, cultures, customs, legal systems, alternative dispute systems, regulatory systems and commercial infrastructures. Furthermore, in most international markets, we would not be the first entrant, and our competitors may be better positioned than we are to succeed. Expanding internationally may subject us to risks that we have either not faced before or increase our exposure to risks that we currently face, including risks associated with:

Many people use smartphones and other mobile devices to access information about local businesses. If we are not successful in developing solutions that generate revenue from our mobile application, or those solutions are not widely adopted, our results of operations and business could be adversely affected.

The number of people who access information about local businesses through mobile devices, including smartphones and handheld tablets or computers, has increased dramatically in the past few years and is expected to increase. Because we do not currently deliver advertising on our mobile app, we have not materially monetized our mobile app to date. As a result, we may not be able to generate meaningful revenue from our mobile app for the foreseeable future. If consumers use our mobile app at the expense of our website, our advertisers may stop or reduce advertising on our website, and they may be unable to advertise on our mobile app unless we develop effective mobile advertising solutions that are compelling to them. Similarly, we may be unable to attract new advertisers unless we develop effective mobile advertising solutions. At the same time, it is important that any mobile advertising solutions that we develop do not adversely affect our users’ experience, even if they might result in increased short-term monetization. We have limited experience with mobile advertising. If we fail to develop effective advertising solutions, if our solutions alienate our user base, or if our solutions are not widely adopted or are insufficiently profitable, our business may suffer.

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Additionally, as new mobile devices and platforms are released, it is difficult to predict the problems we may encounter in developing products for these alternative devices and platforms, and we may need to devote significant resources to the creation, support, and maintenance of such products. In addition, if we experience difficulties in the future in integrating our mobile app into mobile devices or if problems arise with our relationships with providers of mobile operating systems or mobile application download stores, such as those of Apple or Google, if our applications receive unfavorable treatment compared to the promotion and placement of competing applications, such as the order of our products in the Apple AppStore, or if we face increased costs to distribute our mobile app, our future growth and our results of operations could suffer.

We expect to face increased competition in the market.

The market for information regarding local businesses and advertising is intensely competitive and rapidly changing. With the emergence of new technologies and market entrants, competition is likely to intensify in the future. Our competitors include, among others; offline media companies and service providers; newspaper, television, and other media companies, Internet search engines, such as Google, Yahoo! and Bing; and various other online service providers. Our competitors may enjoy competitive advantages, such as greater name recognition, longer operating histories, substantially greater market share, large existing user bases and substantially greater financial, technical and other resources. These companies may use these advantages to offer products similar to ours at a lower price, develop different products to compete with our current solutions and respond more quickly and effectively than we do to new or changing opportunities, technologies, standards or client requirements. In particular, major Internet companies, such as Google, Facebook, Yahoo! and Microsoft may be more successful than us in developing and marketing online advertising offerings directly to local businesses, and many of our advertisers and potential advertisers may choose to purchase online advertising services from these competitors and may reduce their purchases of our products. In addition, many of our current and potential competitors have established marketing relationships with and access to larger client bases. As the market for local online advertising increases, new competitors, business models and solutions are likely to emerge. We also compete with these companies for the attention of contributors and consumers, and may experience decreases in both if our competitors offer more compelling environments. For all of these reasons, we may be unable to maintain or grow the number of people who use our website and mobile app and the number of businesses that use our advertising solutions and we may face pressure to reduce the price of our advertising solutions, in which case our business, results of operations and financial condition will be harmed.

The traffic to our website and mobile application may decline and our business may suffer if other companies copy information from our platform and publish or aggregate it with other information for their own benefit.

From time to time, other companies copy information from our platform, through website scraping, robots or other means, and publish or aggregate it with other information for their own benefit. For example, in parts of 2010 and 2011, Google incorporated content from our website into its own local product without our permission. Google’s users, as a result, may not have visited our website because they found the information they sought on Google. Our Chief Executive Officer recently testified before the U.S. Senate Committee on the Judiciary, Subcommittee on Antitrust, Competition Policy and Consumer Rights regarding Google’s practices in this regard. While we do not believe that Google is still incorporating our content within its local products, we have no assurance that Google or other companies will not copy, publish or aggregate content from our platform in the future.

When third parties copy, publish, or aggregate content from our platform, it makes them more competitive, and decreases the likelihood that consumers will visit our website or use our mobile app to find the information they seek, which could negatively affect our business, results of operations and

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financial condition. We may not be able to detect such third-party conduct in a timely manner and, even if we could, we may not be able to prevent it. In some cases, particularly in the case of websites operating outside of the United States, our available remedies may be inadequate to protect us against such practices. In addition, we may be required to expend significant financial or other resources to successfully enforce our rights.

The impact of worldwide economic conditions, including the resulting effect on advertising spending by local businesses, may adversely affect our business, operating results and financial condition.

Our performance is subject to worldwide economic conditions and their impact on levels of advertising spend by small and medium-sized businesses, which may be disproportionately affected by economic downturns. To the extent that the current economic slowdown continues, or worldwide economic conditions materially deteriorate, our existing and potential advertising clients may no longer consider investment in our advertising solutions a necessity, or may elect to reduce advertising budgets. Historically, economic downturns have resulted in overall reductions in advertising spending. In particular, web-based advertising solutions may be viewed by some of our existing and potential advertising clients as a lower priority and could cause advertisers to reduce the amounts they spend on advertising, terminate their use of our solutions or default on their payment obligations to us. In addition, economic conditions may adversely impact levels of consumer spending, which could adversely impact the numbers of consumers visiting our website and mobile app. Consumer purchases of discretionary items generally decline during recessionary periods and other periods in which disposable income is adversely affected. If spending at many of the local businesses reviewed on our website or mobile app declines, businesses may be less likely to use our advertising products, which could have a material adverse effect on our financial condition and results of operations.

We face potential liability and expense for legal claims based on the content on our platform.

We face potential liability and expense for legal claims relating to the information that we publish on our website and mobile app, including claims for defamation, libel, negligence and copyright or trademark infringement, among others. For example, businesses in the past have claimed, and may in the future claim, that we are responsible for defamatory reviews posted by our users. We expect claims like these to continue, and potentially increase in proportion to the amount of content on our platform. These claims could divert management time and attention away from our business and result in significant costs to investigate and defend, regardless of the merits of the claims. In some instances, we may elect or be compelled to remove content or may be forced to pay substantial damages if we are unsuccessful in our efforts to defend against these claims. If we elect or are compelled to remove valuable content from our website or mobile app, our platform may become less useful to consumers and our traffic may decline, which could have a negative impact on our business and financial performance.

Our business could suffer if the jurisdictions in which we operate change the way in which they regulate the Internet, including regulations relating to user-generated content and privacy.

Our business, including our ability to operate and expand internationally, could be adversely affected if legislation or regulations are adopted, interpreted or implemented in a manner that is inconsistent with our current business practices and that requires changes to these practices or the design of our platform, products or features. For example, if legislation is passed that limits the immunities afforded to websites that publish user-generated content, we may be compelled to remove content from our platform that we would otherwise publish, restrict the types of businesses that our users can review or further verify the identity of our users, among other changes. Similarly, legislation could be passed that limits our ability to use or store information about our users. The Federal Trade

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Commission (“FTC”) already expects companies like ours to comply with guidelines issued under the Federal Trade Commission Act that govern the collection, use and storage of consumer information, establishing principles relating to notice, consent, access and data integrity and security. Our practices are designed to comply with these guidelines as described in our published privacy policy. For example, we disclose that we collect a range of information about our users, such as their names, email addresses, search histories and activity on our platform. We also use and store such information primarily to personalize the experience on our platform, provide customer support and display relevant advertising. While we do not sell or share personally identifiable information with third parties for direct marketing purposes, we do have relationships with third parties that may allow them access to user information for other purposes. For example, when we outsource functions such as technical and customer support, tracking and reporting, quality assurance and payment processing to other companies, we make user information available to those companies to the extent necessary for them to provide the outsourced services. We believe our policies and practices comply with the FTC privacy guidelines and other applicable laws and regulations. However, if our belief proves incorrect, or if these guidelines, laws or regulations or their interpretation change or new legislation or regulations are enacted, we may be compelled to provide additional disclosures to our users, obtain additional consents from our users before collecting or using their information or implement new safeguards to help our users manage our use of their information, among other changes.

Legislative changes such as the examples above have already been proposed both domestically and abroad, including recent proposals by the European Commission. Changes like these could increase our administrative costs and make it more difficult for consumers to use our platform, resulting in less traffic and revenue. Similarly, changes like these could make it more difficult for us to provide effective advertising tools to businesses on our platform, resulting in fewer advertisers and less revenue. In any of the cases above, our business could suffer.

If we fail to manage our growth effectively, our brand, results of operations and business could be harmed.

We have experienced rapid growth in our headcount and operations, which places substantial demands on management and our operational infrastructure. Most of our employees have been with us for fewer than two years. We intend to make substantial investments in our technology, sales and marketing and community management organizations. As we continue to grow, we must effectively integrate, develop and motivate a large number of new employees, including employees in international markets, while maintaining the beneficial aspects of our company culture. If we do not manage the growth of our business and operations effectively, the quality of our platform and efficiency of our operations could suffer, which could harm our brand, results of operations and business.

We may not timely and effectively scale and adapt our existing technology and network infrastructure to ensure that our platform is accessible.

It is important to our success that users in all geographies be able to access our platform at all times. We have previously experienced, and may experience in the future, service disruptions, outages and other performance problems due to a variety of factors, including infrastructure changes, human or software errors, capacity constraints due to an overwhelming number of users accessing our platform simultaneously, and denial of service or fraud or security attacks. In some instances, we may not be able to identify the cause or causes of these performance problems within an acceptable period of time. It may become increasingly difficult to maintain and improve the availability of our platform, especially during peak usage times and as our solutions become more complex and our user traffic increases. If our platform is unavailable when users attempt to access it or it does not load as quickly as they expect, users may seek other services to obtain the information for which they are looking, and may not return to our platform as often in the future, or at all. This would negatively impact our ability to

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attract users and advertisers and increase the frequency with which they use our website and mobile app. We expect to continue to make significant investments to maintain and improve the availability of our platform and to enable rapid releases of new features and products. To the extent that we do not effectively address capacity constraints, upgrade our systems as needed and continually develop our technology and network architecture to accommodate actual and anticipated changes in technology, our business and operating results may be harmed.

Our disaster recovery program contemplates transitioning our platform and data to a backup center in the event of a catastrophe, but we have not yet tested the procedure in full, and the transition procedure may take several days or more to complete. During this time, our platform may be unavailable in whole or in part to our users.

We are, and may in the future be, subject to disputes and assertions by third parties that we violate their rights. These disputes may be costly to defend and could harm our business and operating results.

We currently face, and we expect to face from time to time in the future, allegations that we have violated the rights of third parties, including patent, trademark, copyright and other intellectual property rights. For example, third parties have sued us for allegedly violating their patent rights (we are currently a defendant in seven such suits, all of which involve plaintiffs targeting multiple defendants in the same or similar suits), an action was filed against us on behalf of current and former employees claiming that we violated labor and other laws (we have agreed in principle, subject to court approval, to settle the suit for up to $1.3 million) and various businesses have sued us alleging that we manipulate Yelp reviews in order to coerce them and other businesses to pay for Yelp advertising (one such suit was voluntarily dismissed, and two others were consolidated and recently dismissed with prejudice, although the plaintiffs are seeking an appeal).

Other claims against us can be expected to be made in the future. Even if the claims are without merit, the costs associated with defending these types of claims may be substantial, both in terms of time, money, and management distraction. In particular, patent and other intellectual property litigation may be protracted and expensive, and the results are difficult to predict and may require us to stop offering certain features, purchase licenses or modify our products and features while we develop non-infringing substitutes or may result in significant settlement costs. We do not own any patents, and, therefore, may be unable to deter competitors or others from pursuing patent or other intellectual property infringement claims against us.

The results of litigation and claims to which we may be subject cannot be predicted with certainty. Even if these matters do not result in litigation or are resolved in our favor or without significant cash settlements, these matters, and the time and resources necessary to litigate or resolve them, could harm our business, results or operations and reputation.

Some of our solutions contain open source software, which may pose particular risks to our proprietary software and solutions.

We use open source software in our solutions and will use open source software in the future. From time to time, we may face claims from third parties claiming ownership of, or demanding release of, the open source software and/or derivative works that we developed using such software (which could include our proprietary source code), or otherwise seeking to enforce the terms of the applicable open source license. These claims could result in litigation and could require us to purchase a costly license or cease offering the implicated solutions unless and until we can re-engineer them to avoid infringement. This re-engineering process could require significant additional research and development resources. In addition to risks related to license requirements, use of certain open source

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software can lead to greater risks than use of third-party commercial software, as open source licensors generally do not provide warranties or controls on the origin of software. Any of these risks could be difficult to eliminate or manage, and, if not addressed, could have a negative effect on our business and operating results.

We make the consumer experience our highest priority. Our dedication to making decisions based primarily on the best interests of consumers may cause us to forgo short-term gains and advertising revenue.

We base many of our decisions upon the best interests of the consumers who use our platform. We believe that this approach has been essential to our success in increasing our user growth rate and the frequency with which consumers use our platform and has served the long-term interests of our company and our stockholders. In the past, we have forgone, and we may in the future forgo, certain expansion or revenue opportunities that we do not believe are in the best interests of consumers, even if such decisions negatively impact our results of operations in the short term, and we believe that continued adherence to this principle will, in the long term, benefit our stockholders. In particular, our approach of putting our consumers first may negatively impact our relationships with our existing or prospective advertisers. For example, unless we believe that a review violates our terms of service, such as reviews that contain hate speech or bigotry, we allow the review to remain on the platform, even if the business disputes its accuracy. Certain advertisers may therefore perceive us as an impediment to their success as a result of negative reviews and ratings. This practice could result in a loss of advertisers, which in turn could harm our results of operations.

We rely on third-party service providers for many aspects of our business, and any failure to maintain these relationships could harm our business.

We rely on data about local businesses from third parties, including various yellow pages and other third parties that license such information to us. We also rely on third parties for other aspects of our business, such as mapping functionality and administrative software solutions. If these third parties experience difficulty meeting our requirements or standards, or our licenses are revoked or not renewed, it could make it difficult for us to operate some aspects of our business, which could damage our reputation. In addition, if such third-party service providers were to cease operations, temporarily or permanently, face financial distress or other business disruption, increase their fees or if our relationships with these providers deteriorate, we could suffer increased costs and delays in our ability to provide consumers and advertisers with content or provide similar services until an equivalent provider could be found or we could develop replacement technology or operations. In addition, if we are unsuccessful in choosing or finding high-quality partners, if we fail to negotiate cost-effective relationships with them, or if we ineffectively manage these relationships, it could have an adverse impact on our business and financial performance.

We expect a number of factors to cause our operating results to fluctuate on a quarterly and annual basis, which may make it difficult to predict our future performance.

Our operating results could vary significantly from quarter to quarter and year to year because of a variety of factors, many of which are outside of our control. As a result, comparing our operating results on a period-to-period basis may not be meaningful. In addition to other risk factors discussed in this section, factors that may contribute to the variability of our quarterly and annual results include:

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Because we recognize most of the revenue from our advertising products over the term of an agreement, a significant downturn in our business may not be immediately reflected in our results of operations.

We recognize revenue from sales of our advertising products over the terms of the applicable agreements, which are generally three, six or 12 months. As a result, a significant portion of the revenue we report in each quarter is generated from agreements entered into during previous quarters. Consequently, a decline in new or renewed agreements in any one quarter may not significantly impact our revenue in that quarter but will negatively affect our revenue in future quarters. In addition, we may be unable to adjust our fixed costs in response to reduced revenue. Accordingly, the effect of significant declines in advertising sales may not be reflected in our short-term results of operations.

We rely on the performance of highly skilled personnel, and if we are unable to attract, retain and motivate well-qualified employees, our business could be harmed.

We believe our success has depended, and continues to depend, on the efforts and talents of our employees, including Jeremy Stoppelman, our Chief Executive Officer, Geoff Donaker, our Chief Operating Officer, and our software engineers, marketing professionals and advertising sales staff. Our future success depends on our continuing ability to attract, develop, motivate and retain highly qualified and skilled employees. Qualified individuals are in high demand, and we may incur significant costs to attract them. In addition, the loss of any of our senior management or key employees could materially

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adversely affect our ability to execute our business plan, and we may not be able to find adequate replacements. All of our officers and other U.S. employees are at-will employees, which means they may terminate their employment relationship with us at any time, and their knowledge of our business and industry would be extremely difficult to replace. We cannot ensure that we will be able to retain the services of any members of our senior management or other key employees. If we do not succeed in attracting well-qualified employees or retaining and motivating existing employees, our business could be harmed.

Failure to protect or enforce our intellectual property rights could harm our business and results of operations.

We regard the protection of our trade secrets, copyrights, trademarks and domain names as critical to our success. In particular, we must maintain, protect and enhance the “Yelp” brand. We pursue the registration of our domain names, trademarks, and service marks in the United States and in certain jurisdictions abroad. We strive to protect our intellectual property rights by relying on federal, state and common law rights, as well as contractual restrictions. We typically enter into confidentiality and invention assignment agreements with our employees and contractors, and confidentiality agreements with parties with whom we conduct business in order to limit access to, and disclosure and use of, our proprietary information. However, these contractual arrangements and the other steps we have taken to protect our intellectual property may not prevent the misappropriation or disclosure of our proprietary information nor deter independent development of similar technologies by others.

Effective trade secret, copyright, trademark and domain name protection is expensive to develop and maintain, both in terms of initial and ongoing registration requirements and expenses and the costs of defending our rights. We are seeking to protect our trademarks and domain names in an increasing number of jurisdictions, a process that is expensive and may not be successful or which we may not pursue in every location. Litigation may be necessary to enforce our intellectual property rights, protect our respective trade secrets or determine the validity and scope of proprietary rights claimed by others. Any litigation of this nature, regardless of outcome or merit, could result in substantial costs and diversion of management and technical resources, any of which could adversely affect our business and operating results. We may incur significant costs in enforcing our trademarks against those who attempt to imitate our “Yelp” brand. If we fail to maintain, protect and enhance our intellectual property rights, our business and operating results may be harmed.

We may be unable to continue to use the domain names that we use in our business, or prevent third parties from acquiring and using domain names that infringe on, are similar to, or otherwise decrease the value of our brand or our trademarks or service marks.

We have registered domain names for our website that we use in our business, such as Yelp.com. If we lose the ability to use a domain name, whether due to trademark claims, failure to renew the applicable registration, or any other cause, we may be forced to market our products under a new domain name, which could cause us substantial harm, or to incur significant expense in order to purchase rights to the domain name in question. In addition, our competitors and others could attempt to capitalize on our brand recognition by using domain names similar to ours. Domain names similar to ours have been registered in the United States and elsewhere. We may be unable to prevent third parties from acquiring and using domain names that infringe on, are similar to, or otherwise decrease the value of our brand or our trademarks or service marks. Protecting and enforcing our rights in our domain names may require litigation, which could result in substantial costs and diversion of management’s attention.

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If our security measures are compromised, or if our platform is subject to attacks that degrade or deny the ability of users to access our content, users may curtail or stop use of our platform.

Like all online services, our platform is vulnerable to computer viruses, break-ins, phishing attacks, attempts to overload our servers with denial-of-service or other attacks and similar disruptions from unauthorized use of our computer systems, any of which could lead to interruptions, delays, or website shutdowns, causing loss of critical data or the unauthorized disclosure or use of personally identifiable or other confidential information. If we experience compromises to our security that result in performance or availability problems, the complete shutdown of our website or the loss or unauthorized disclosure of confidential information, our users or advertisers may lose trust and confidence in us and decrease their use of our platform or stop using our platform entirely. Because the techniques used to obtain unauthorized access, disable or degrade service or sabotage systems change frequently, often are not recognized until launched against a target and may originate from less regulated and remote areas around the world, we may be unable to proactively address these techniques or to implement adequate preventative measures. In addition, user and business owner accounts and profile pages could be hacked, hijacked, altered or otherwise claimed or controlled by unauthorized persons. For example, we enable businesses to create free online business accounts and claim the business profile pages for each of their business locations. We verify these claims through an automated telephone verification process, which is designed to confirm that the person setting up the account is affiliated with the business by confirming that the person has access to the business’s telephone. Our verification system could fail to confirm that the recipient of the call is an authorized representative of the business, or mistakenly allow an unauthorized representative to claim the business’s profile page. Any or all of these issues could negatively impact our ability to attract new users or could deter current users from returning or reduce the frequency with which consumers and advertisers use our solutions, cause existing or potential advertisers to cancel their contracts or subject us to third-party lawsuits, regulatory fines or other action or liability, thereby harming our results of operations.

We process, store and use personal information and other data, which subjects us to governmental regulation and other legal obligations related to privacy. Our actual or perceived failure to comply with such obligations could harm our business.

We receive, store and process personal information and other user data, including credit card information for certain users. There are numerous federal, state and local laws around the world regarding privacy and the storing, sharing, use, processing, disclosure and protection of personal information and other user data, the scope of which are changing, subject to differing interpretations, and may be inconsistent between countries or conflict with other rules. We generally comply with industry standards and are subject to the terms of our privacy policies and privacy-related obligations to third parties (including, in certain instances, voluntary third-party certification bodies such as TRUSTe). It is possible that these obligations may be interpreted and applied in a manner that is inconsistent from one jurisdiction to another and may conflict with other rules or our practices. Any failure or perceived failure by us to comply with our privacy policies, our privacy-related obligations to users or other third parties, or our privacy-related legal obligations, or any compromise of security that results in the unauthorized release or transfer of personally identifiable information or other user data, may result in governmental enforcement actions, litigation or negative publicity and could cause our users and advertisers to lose trust in us, which could have an adverse effect on our business. Additionally, if third parties with whom we work, such as advertisers, vendors or developers, violate applicable laws or our policies, such violations may also put our users’ information at risk and could have an adverse effect on our business.

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Our business is subject to a variety of U.S. and foreign laws, many of which are unsettled and still developing and which could subject us to claims or otherwise harm our business.

We are subject to a variety of laws in the United States and abroad, including laws regarding data retention, privacy, distribution of user-generated content and consumer protection, that are frequently evolving and developing. The scope and interpretation of the laws that are or may be applicable to us are often uncertain and may be conflicting, particularly outside the United States. For example, laws relating to the liability of providers of online services for activities of their users and other third parties are currently being tested by a number of claims, including actions based on invasion of privacy and other torts, unfair competition, copyright and trademark infringement, and other theories based on the nature and content of the materials searched, the ads posted, or the content provided by users. In addition, regulatory authorities around the world are considering a number of legislative and regulatory proposals concerning data protection and other matters that may be applicable to our business. It is also likely that if our business grows and evolves and our solutions are used in a greater number of countries, we will become subject to laws and regulations in additional jurisdictions. It is difficult to predict how existing laws will be applied to our business and the new laws to which we may become subject.

If we are not able to comply with these laws or regulations or if we become liable under these laws or regulations, we could be directly harmed, and we may be forced to implement new measures to reduce our exposure to this liability. This may require us to expend substantial resources or to discontinue certain products or features, which would negatively affect our business. In addition, the increased attention focused upon liability issues as a result of lawsuits and legislative proposals could harm our reputation or otherwise impact the growth of our business. Any costs incurred to prevent or mitigate this potential liability could also harm our business and operating results.

Domestic and foreign laws may be interpreted and enforced in ways that impose new obligations on us with respect to Yelp Deals, which may harm our business and results of operations.

Our Yelp Deals products may be deemed gift certificates, store gift cards, general-use prepaid cards or other vouchers, or “gift cards”, subject to, among other laws, the federal Credit Card Accountability Responsibility and Disclosure Act of 2009 (“Credit CARD Act of 2009”) and similar federal, state and foreign laws. Many of these laws include specific disclosure requirements and prohibitions or limitations on the use of expiration dates and the imposition of certain fees. For example, the Credit CARD Act of 2009 requires that gift cards expire no earlier than five years after their issue. Yelp Deals are comprised of two components: (i) the purchase value, which is the amount paid by the purchaser and which does not expire, and (ii) the promotional value, which is the remaining value for which the Yelp Deal can be redeemed during a limited period, which typically ends one year after the date of purchase. If, contrary to our belief, the Credit CARD Act of 2009 and similar state laws were held to apply to the promotional value component of Yelp Deals, consumers would be entitled to redeem the promotional value component of their Yelp Deals for up to five years after their issue, and we could face liability for redemption periods that are less than five years. Various companies that provide deal products similar to ours are currently defendants in purported class action lawsuits that have been filed in federal and state court claiming that their deal products are subject to the Credit CARD Act of 2009 and various state laws governing gift cards and that the defendants have violated these laws as a result of expiration dates and other restrictions they have placed on their deals. Similar lawsuits have been filed in other locations in which we plan to sell our Yelp Deals, such as the Canadian province of Ontario, alleging similar violations of provincial legislation governing gift cards.

The application of various other laws and regulations to our products, and particularly our Yelp Deals, is uncertain. These include laws and regulations pertaining to unclaimed and abandoned property, partial redemption, refunds, revenue-sharing restrictions on certain trade groups and

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professions, sales and other local taxes and the sale of alcoholic beverages. For example, although it is the responsibility of merchants to redeem or refund unexpired Yelp Deals that they offer through our platform, the law might be interpreted to require that we redeem or refund them. Because merchants alone, and not Yelp, are in a position to track the redemption of Yelp Deals, we may not be able to comply with such a requirement without substantial and potentially costly changes to our infrastructure and business practices. In addition, we may become, or be determined to be, subject to federal, state or foreign laws regulating money transmitters or aimed at preventing money laundering or terrorist financing, including the Bank Secrecy Act, the USA PATRIOT Act and other similar future laws or regulations.

If we become subject to claims or are required to alter our business practices as a result of current or future laws and regulations, our revenue could decrease, our costs could increase and our business could otherwise be harmed. In addition, the costs and expenses associated with defending any actions related to such additional laws and regulations and any payments of related penalties, fines, judgments or settlements could harm our business.

We may require additional capital to support business growth, and this capital might not be available on acceptable terms, if at all.

We intend to continue to make investments to support our business growth and may require additional funds to respond to business challenges, including the need to develop new features and products or enhance our existing services, improve our operating infrastructure or acquire complementary businesses and technologies. Accordingly, we may need to engage in equity or debt financings to secure additional funds. If we raise additional funds through future issuances of equity or convertible debt securities, our existing stockholders could suffer significant dilution, and any new equity securities we issue could have rights, preferences and privileges superior to those of holders of our Class A common stock. Any debt financing we secure in the future could involve restrictive covenants relating to our capital raising activities and other financial and operational matters, which may make it more difficult for us to obtain additional capital and to pursue business opportunities, including potential acquisitions. We may not be able to obtain additional financing on terms favorable to us, if at all. If we are unable to obtain adequate financing or financing on terms satisfactory to us when we require it, our ability to continue to support our business growth and to respond to business challenges could be significantly impaired, and our business may be harmed.

We may acquire other companies or technologies, which could divert our management’s attention, result in additional dilution to our stockholders and otherwise disrupt our operations and harm our operating results.

Our success will depend, in part, on our ability to expand our product offerings and grow our business in response to changing technologies, user and advertiser demands and competitive pressures. In some circumstances, we may determine to do so through the acquisition of complementary businesses or technologies rather than through internal development. We do not have experience acquiring other businesses and technologies. The pursuit of potential acquisitions may divert the attention of management and cause us to incur expenses in identifying, investigating and pursuing suitable acquisitions, whether or not they are consummated. Furthermore, even if we successfully acquire additional businesses or technologies, we may not be able to integrate the acquired personnel, operations and technologies successfully, or effectively manage the combined business following the acquisition. We also may not achieve the anticipated benefits from the acquired business or technology. In addition, we may unknowingly inherit liabilities from future acquisitions that arise after the acquisition and are not adequately covered by indemnities. Acquisitions could also result in dilutive issuances of equity securities or the incurrence of debt, which could adversely affect our results of operations. If an acquired business or technology fails to meet our expectations, our business, results of operations and financial condition may suffer.

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Our business is subject to the risks of earthquakes, fires, floods and other natural catastrophic events and to interruption by man-made problems such as computer viruses or terrorism.

Our systems and operations are vulnerable to damage or interruption from earthquakes, fires, floods, power losses, telecommunications failures, terrorist attacks, acts of war, human errors, break-ins and similar events. For example, a significant natural disaster, such as an earthquake, fire or flood, could have a material adverse impact on our business, operating results and financial condition, and our insurance coverage may be insufficient to compensate us for losses that may occur. Our U.S. corporate offices and one of the facilities we lease to house our computer and telecommunications equipment are located in the San Francisco Bay Area, a region known for seismic activity. In addition, acts of terrorism, which may be targeted at metropolitan areas that have higher population density than rural areas, could cause disruptions in our or our local business advertisers’ businesses or the economy as a whole. Our servers may also be vulnerable to computer viruses, break-ins and similar disruptions from unauthorized tampering with our computer systems, which could lead to interruptions, delays, loss of critical data or the unauthorized disclosure of confidential client data. We may not have sufficient protection or recovery plans in certain circumstances, such as natural disasters affecting the San Francisco Bay Area, and our business interruption insurance may be insufficient to compensate us for losses that may occur. As we rely heavily on our servers, computer and communications systems and the Internet to conduct our business and provide high quality customer service, such disruptions could negatively impact our ability to run our business and either directly or indirectly disrupt our local business advertisers’ businesses, which could have an adverse affect on our business, operating results and financial condition.

The intended tax benefits of our corporate structure and intercompany arrangements depend on the application of the tax laws of various jurisdictions and on how we operate our business.

Our corporate structure and intercompany arrangements, including the manner in which we develop and use our intellectual property and the transfer pricing of our intercompany transactions, are intended to reduce our worldwide effective tax rate. The application of the tax laws of various jurisdictions, including the United States, to our international business activities is subject to interpretation and depends on our ability to operate our business in a manner consistent with our corporate structure and intercompany arrangements. The taxing authorities of the jurisdictions in which we operate may challenge our methodologies for valuing developed technology or intercompany arrangements, including our transfer pricing, or determine that the manner in which we operate our business does not achieve the intended tax consequences, which could increase our worldwide effective tax rate and harm our financial position and results of operations.

Our corporate structure includes legal entities located in jurisdictions with income tax rates lower than the U.S. statutory tax rate. Our intercompany arrangements allocate income to such entities in accordance with arm’s-length principles and commensurate with functions performed, risks assumed and ownership of valuable corporate assets. We believe that income taxed in certain foreign jurisdictions at a lower rate relative to the U.S. statutory rate will have a beneficial impact on our worldwide effective tax rate.

Significant judgment is required in evaluating our tax positions and determining our provision for income taxes. During the ordinary course of business, there are many transactions and calculations for which the ultimate tax determination is uncertain. For example, our effective tax rates could be adversely affected by earnings being lower than anticipated in countries where we have lower statutory rates and higher than anticipated in countries where we have higher statutory rates, by changes in foreign currency exchange rates or by changes in the relevant tax, accounting and other laws, regulations, principles and interpretations. As we operate in numerous taxing jurisdictions, the application of tax laws can be subject to diverging and sometimes conflicting interpretations by tax

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authorities of these jurisdictions. It is not uncommon for taxing authorities in different countries to have conflicting views, for instance, with respect to, among other things, the manner in which the arm’s length standard is applied for transfer pricing purposes, or with respect to the valuation of intellectual property. In addition, tax laws are dynamic and subject to change as new laws are passed and new interpretations of the law are issued or applied. In particular, there is uncertainty in relation to the U.S. tax legislation in terms of the future corporate tax rate but also in terms of the U.S. tax consequences of income derived from income related to intellectual property earned overseas in low tax jurisdictions.

Our existing corporate structure and intercompany arrangements have been implemented in a manner we believe is in compliance with current prevailing tax laws. However, the tax benefits which we intend to eventually derive could be undermined if we are unable to adapt the manner in which we operate our business and due to changing tax laws.

The enactment of legislation implementing changes in the U.S. taxation of international business activities or the adoption of other tax reform policies could materially impact our financial condition and results of operations.

The current administration has made public statements indicating that it has made international tax reform a priority, and key members of the U.S. Congress have conducted hearings and proposed new legislation. Recent changes to U.S. tax laws, including limitations on the ability of taxpayers to claim and utilize foreign tax credits and the deferral of certain tax deductions until earnings outside of the United States are repatriated to the United States, as well as changes to U.S. tax laws that may be enacted in the future, could impact the tax treatment of our foreign earnings. Due to the expanding scale of our international business activities, any changes in the U.S. taxation of such activities may increase our worldwide effective tax rate and harm our financial condition and results of operations.

Risks Related to this Offering and Ownership of Our Class A Common Stock

The dual class structure of our common stock has the effect of concentrating voting control with those stockholders who held our stock prior to this offering, including our founders, directors, executive officers and employees and their affiliates, and limiting your ability to influence corporate matters.

Our Class B common stock has 10 votes per share, and our Class A common stock, which is the stock we are offering in this initial public offering, has one vote per share. Stockholders who hold shares of Class B common stock, including our founders, directors, executive officers and employees and their affiliates, will together beneficially own shares representing approximately 98.7% of the voting power of our outstanding capital stock following this offering. Consequently, the holders of Class B common stock collectively will continue to be able to control all matters submitted to our stockholders for approval even if their stock holdings represent less than 50% of the outstanding shares of our common stock. Because of the 10-to-1 voting ratio between our Class B and Class A common stock, the holders of our Class B common stock collectively will continue to control a majority of the combined voting power of our common stock even when the shares of Class B common stock represent a small minority of all outstanding shares of our Class A and Class B common stock. This concentrated control will limit your ability to influence corporate matters for the foreseeable future, and, as a result, the market price of our Class A common stock could be adversely affected.

Future transfers by holders of Class B common stock will generally result in those shares converting to Class A common stock, which will have the effect, over time, of increasing the relative voting power of those holders of Class B common stock who retain their shares in the long term, which may include existing founders, officers and directors and their affiliates.

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Our share price may be volatile, and you may be unable to sell your shares at or above the offering price, if at all.

The initial public offering price for the shares of our Class A common stock has been determined by negotiations between us and the representative of the underwriters and may not be indicative of prices that will prevail in the trading market. The market price of our Class A common stock could be subject to wide fluctuations in response to many risk factors listed in this section, and others beyond our control, including:

Furthermore, the stock markets recently have experienced extreme price and volume fluctuations that have affected and continue to affect the market prices of equity securities of many companies. These fluctuations often have been unrelated or disproportionate to the operating performance of those companies. These broad market and industry fluctuations, as well as general economic, political and market conditions such as recessions, interest rate changes or international currency fluctuations, may negatively impact the market price of our Class A common stock. If the market price of our Class A common stock after this offering does not exceed the initial public offering price, you may not realize any return on your investment in us and may lose some or all of your investment. In the past, companies that have experienced volatility in the market price of their stock have been subject to securities class action litigation. We may be the target of this type of litigation in the future. Securities litigation against us could result in substantial costs and divert our management’s attention from other business concerns, which could harm our business.

An active public trading market may not develop or be sustained following this offering.

Prior to this offering, there has been no public market for our common stock. Although we have been approved to list our Class A common stock on the New York Stock Exchange, an active trading market may not develop following the completion of this offering or, if developed, may not be sustained. The lack of an active market may impair your ability to sell your shares at the time you wish to sell them or at a price that you consider reasonable. The lack of an active market may also reduce the fair value of your shares. An inactive market may also impair our ability to raise capital to continue to fund operations by selling shares and may impair our ability to acquire other companies or technologies by using our shares as consideration.

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We do not intend to pay dividends for the foreseeable future, and as a result your ability to achieve a return on your investment will depend on appreciation in the price of our Class A common stock.

We have never declared or paid any cash dividends on our common stock and do not intend to pay any cash dividends in the foreseeable future. We anticipate that we will retain all of our future earnings for use in the development of our business and for general corporate purposes. Any determination to pay dividends in the future will be at the discretion of our board of directors. Accordingly, investors must rely on sales of their Class A common stock after price appreciation, which may never occur, as the only way to realize any future gains on their investments.

Anti-takeover provisions in our charter documents and under Delaware law could make an acquisition of us more difficult, limit attempts by our stockholders to replace or remove our current management and limit the market price of our Class A common stock.

Provisions in our certificate of incorporation and bylaws, as amended and restated in connection with this offering, may have the effect of delaying or preventing a change in control or changes in our management. Our amended and restated certificate of incorporation and amended and restated bylaws will include provisions that:

These provisions may frustrate or prevent any attempts by our stockholders to replace or remove our current management by making it more difficult for stockholders to replace members of our board of directors, which is responsible for appointing the members of our management. In addition, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporation Law, which generally prohibits a Delaware corporation from engaging in any of a broad range of business combinations with any “interested” stockholder for a period of three years following the date on which the stockholder became an “interested” stockholder.

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Our future depends in part on the interests and influence of key stockholders.

Following this offering, our directors, executive officers and holders of more than 5% of our common stock, some of whom are represented on our board of directors, together with their affiliates, (including institutional investors such as Benchmark Capital, Bessemer Venture Partners and Elevation Partners) will beneficially own 46,657,486 shares our Class B common stock, or 77.9% of our outstanding capital stock, which will represent 87.3% of the voting power of our outstanding capital stock. As a result, these stockholders will, immediately following this offering, be able to determine the outcome of matters submitted to our stockholders for approval. This ownership could affect the value of your shares of common stock by, for example, these stockholders electing to delay, defer or prevent a change in corporate control, merger, consolidation, takeover or other business combination.

We may invest or spend the proceeds of this offering in ways with which you may not agree or in ways which may not yield a return.

The net proceeds from the sale of shares by us in the offering may be used for general corporate purposes, including working capital. We may also use a portion of the net proceeds to acquire complementary businesses, products, services or technologies. However, we do not have any agreements or commitments for any acquisitions at this time. Our management will have considerable discretion in the application of the net proceeds, and you will not have the opportunity, as part of your investment decision, to assess whether the proceeds are being used appropriately. The net proceeds may be invested with a view towards long-term benefits for our stockholders and this may not increase our operating results or market value. Until the net proceeds are used, they may be placed in investments that do not produce significant income or that may lose value.

If securities or industry analysts do not publish research or reports about our business, or publish negative reports about our business, our share price and trading volume could decline.

The trading market for our Class A common stock will, to some extent, depend on the research and reports that securities or industry analysts publish about us or our business. We do not have any control over these analysts. If our financial performance fails to meet analyst estimates or one or more of the analysts who cover us downgrade our shares or change their opinion of our shares, our share price would likely decline. If one or more of these analysts cease coverage of our company or fail to regularly publish reports on us, we could lose visibility in the financial markets, which could cause our share price or trading volume to decline.

Prior to this offering, there has been limited trading of our common stock in alternative online markets at prices that may be higher than what our Class A common stock will trade at once it is listed.

While, prior to this offering, our shares have not been listed on any stock exchange or other public trading market, there has been some trading of our securities, for instance, in private trades or trades on alternative online markets, such as SecondMarket and SharesPost, that exist for privately traded securities. These markets are speculative, and the trading price of our securities on these markets is privately negotiated. We cannot assure you that the price of our Class A common stock will equal or exceed the price at which our securities have traded on these private secondary markets.

Future sales of our Class A common stock in the public market could cause our share price to decline.

Sales of a substantial number of shares of our Class A common stock in the public market after this offering, or the perception that these sales might occur, could depress the market price of our Class A common stock and could impair our ability to raise capital through the sale of additional equity

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securities. Based on the total number of outstanding shares of our common stock as of December 31, 2011, upon the closing of this offering, we will have 7,150,000 shares of Class A common stock and 52,723,181 shares of Class B common stock outstanding, assuming no exercise of our outstanding options and the sale of 50,000 shares of our Class A common stock to be sold by the selling stockholder.

All of the shares of Class A common stock sold in this offering will be freely tradable without restrictions or further registration under the Securities Act of 1933, as amended, or the “Securities Act”, except for any shares held by our affiliates as defined in Rule 144 under the Securities Act. The remaining 52,723,181 shares of Class B common stock outstanding after this offering, based on shares outstanding as of December 31, 2011, will be restricted as a result of securities laws, lock-up agreements or other contractual restrictions that restrict transfers for 180 days after the date of this prospectus, subject to certain extensions.

The requirements of being a public company may strain our resources, divert management’s attention and affect our ability to attract and retain qualified board members.

As a public company, we will be subject to the reporting requirements of the Securities Exchange Act of 1934, as amended, or the “Exchange Act”, the Sarbanes-Oxley Act, the Dodd-Frank Act, the listing requirements of the New York Stock Exchange and other applicable securities rules and regulations. Compliance with these rules and regulations will increase our legal and financial compliance costs, make some activities more difficult, time-consuming or costly and increase demand on our systems and resources. The Exchange Act requires, among other things, that we file annual, quarterly and current reports with respect to our business and operating results. The Sarbanes-Oxley Act requires, among other things, that we maintain effective disclosure controls and procedures and internal control over financial reporting. In order to maintain and, if required, improve our disclosure controls and procedures and internal control over financial reporting to meet this standard, significant resources and management oversight may be required. As a result, management’s attention may be diverted from other business concerns, which could harm our business and operating results. Although we have already hired additional employees to comply with these requirements, we may need to hire more employees in the future, which will increase our costs and expenses.

In addition, changing laws, regulations and standards relating to corporate governance and public disclosure are creating uncertainty for public companies, increasing legal and financial compliance costs and making some activities more time consuming. These laws, regulations and standards are subject to varying interpretations, in many cases due to their lack of specificity, and, as a result, their application in practice may evolve over time as new guidance is provided by regulatory and governing bodies. This could result in continuing uncertainty regarding compliance matters and higher costs necessitated by ongoing revisions to disclosure and governance practices. We intend to invest resources to comply with evolving laws, regulations and standards, and this investment may result in increased general and administrative expenses and a diversion of management’s time and attention from revenue-generating activities to compliance activities. If our efforts to comply with new laws, regulations and standards differ from the activities intended by regulatory or governing bodies due to ambiguities related to practice, regulatory authorities may initiate legal proceedings against us and our business may be harmed.

We also expect that being a public company and these new rules and regulations will make it more expensive for us to obtain director and officer liability insurance, and we may be required to accept reduced coverage or incur substantially higher costs to obtain coverage. These factors could also make it more difficult for us to attract and retain qualified members of our board of directors, particularly to serve on our audit committee and compensation committee, and qualified executive officers.

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As a result of disclosure of information in this prospectus and in filings required of a public company, our business and financial condition will become more visible, which we believe may result in increased threatened or actual litigation, including by competitors and other third parties. If such claims are successful, our business and operating results could be harmed, and even if the claims do not result in litigation or are resolved in our favor, these claims, and the time and resources necessary to resolve them, could divert the resources of our management and harm our business and operating results.

As a result of becoming a public company, we will be obligated to develop and maintain proper and effective internal controls over financial reporting. We may not complete our analysis of our internal controls over financial reporting in a timely manner, or these internal controls may not be determined to be effective, which may adversely affect investor confidence in our company and, as a result, the value of our Class A common stock.

We will be required, pursuant to Section 404 of the Sarbanes-Oxley Act, to furnish a report by management on, among other things, the effectiveness of our internal control over financial reporting for the first fiscal year beginning after the effective date of this offering. This assessment will need to include disclosure of any material weaknesses identified by our management in our internal control over financial reporting, as well as a statement that our auditors have issued an attestation report on our management’s assessment of our internal controls.

We are in the early stages of the costly and challenging process of compiling the system and processing documentation necessary to perform the evaluation needed to comply with Section 404. We may not be able to complete our evaluation, testing and any required remediation in a timely fashion. During the evaluation and testing process, if we identify one or more material weaknesses in our internal control over financial reporting, we will be unable to assert that our internal controls are effective.

If we are unable to assert that our internal control over financial reporting is effective, or if our auditors are unable to express an opinion on the effectiveness of our internal controls, we could lose investor confidence in the accuracy and completeness of our financial reports, which would cause the price of our Class A common stock to decline.

Because the initial public offering price of our Class A common stock will be substantially higher than the pro forma net tangible book value per share of our outstanding Class A and Class B common stock following this offering, new investors will experience immediate and substantial dilution.

The initial public offering price of our Class A common stock will be substantially higher than the pro forma net tangible book value per share of our Class A and Class B common stock immediately following this offering based on the total value of our tangible assets less our total liabilities. Therefore, if you purchase shares of our Class A common stock in this offering, you will experience immediate dilution of $12.88 per share, the difference between the price per share you pay for our Class A common stock and its pro forma net tangible book value per share as of December 31, 2011, after giving effect to the issuance of shares of our Class A common stock in this offering. See “Dilution” for more information. Furthermore, investors purchasing shares of our Class A common stock in this offering will only own approximately 11.9% of our outstanding shares of Class A and Class B common stock (and have 1.3% of the combined voting power of the outstanding shares of our Class A and Class B common stock), after the offering even though their aggregate investment will represent 64.3% of the total consideration received by us in connection with all initial sales of 59,873,181 shares of our capital stock outstanding as of December 31, 2011, after giving effect to the issuance of 7,100,000 shares of our Class A common stock in this offering and 50,000 shares of our Class A common stock to be sold by the selling stockholder. To the extent outstanding options to purchase our Class B common stock are exercised, investors purchasing our Class A common stock in this offering will experience further dilution.

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This prospectus, including the sections entitled “Prospectus Summary,” “Risk Factors,” “Use of Proceeds,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Business,” contains forward-looking statements. In some cases you can identify these statements by forward-looking words such as “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “could,” “would,” “project,” “plan,” “expect” or the negative or plural of these words or similar expressions. These forward-looking statements include, but are not limited to, statements concerning the following:

These forward-looking statements are subject to a number of risks, uncertainties and assumptions, including those described in “Risk Factors.” Moreover, we operate in a very competitive and rapidly changing environment. New risks emerge from time to time. It is not possible for our management to predict all risks, nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements we may make. In light of these risks, uncertainties and assumptions, the forward-looking events and circumstances discussed in this prospectus may not occur and actual results could differ materially and adversely from those anticipated or implied in the forward-looking statements.

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You should not rely upon forward-looking statements as predictions of future events. We cannot guarantee that the future results, levels of activity, performance or events and circumstances reflected in the forward-looking statements will be achieved or occur. Moreover, except as required by law, neither we nor any other person assumes responsibility for the accuracy and completeness of the forward-looking statements. We undertake no obligation to update publicly any forward-looking statements for any reason after the date of this prospectus to conform these statements to actual results or to changes in our expectations.

You should read this prospectus and the documents that we reference in this prospectus and have filed with the Securities and Exchange Commission as exhibits to the registration statement of which this prospectus is a part with the understanding that our actual future results, levels of activity, performance and events and circumstances may be materially different from what we expect.

MARKET, INDUSTRY AND OTHER DATA

Unless otherwise indicated, information contained in this prospectus concerning our industry and the market in which we operate, including our market opportunity and market size, is based on information from various sources, on assumptions that we have made that are based on those data and other similar sources and on our knowledge of the markets for our products. These data involve a number of assumptions and limitations, and you are cautioned not to give undue weight to such estimates. The Gartner Report, “Forecast: Mobile Advertising, Worldwide, 2008-2015,” described herein, (the “Gartner Report”) represents data, research opinion or viewpoints published, as part of a syndicated subscription service, by Gartner, Inc. (“Gartner”) and are not representations of fact. Each Gartner Report speaks as of its original publication date (and not as of the date of this prospectus), and the opinions expressed in the Gartner Report are subject to change without notice. IDC estimates of worldwide smartphone shipments in 2015 derive from IDC, Worldwide Smartphone 2011-2015 Forecast Update: September 2011, doc # 230173, September 2011; estimates of mobile app downloads in the United States by 2013 derive from IDC, Worldwide and U.S. Mobile Applications, Storefronts, Developer, and In-App Advertising 2011-2015 Forecast: Emergence of Postdownload Business Models, doc #228221, June 2011; and estimates of local businesses worldwide as of 2009 derive from IDC, Worldwide Small and Medium-Sized Business Company Count Update by Region, 2010, doc #224528, August 2010.

We have not independently verified any third-party information. While we believe the market position, market opportunity and market size information included in this prospectus is generally reliable, such information is inherently imprecise. In addition, projections, assumptions and estimates of our future performance and the future performance of the industry in which we operate is necessarily subject to a high degree of uncertainty and risk due to a variety of factors, including those described in “Risk Factors” and elsewhere in this prospectus. These and other factors could cause results to differ materially from those expressed in the estimates made by the independent parties and by us.

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USE OF PROCEEDS

We estimate that we will receive net proceeds from the sale of Class A common stock offered by us of approximately $96.2 million, based upon the initial public offering price of $15.00 per share, and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. If the underwriters’ option to purchase additional shares of Class A common stock is exercised in full, we estimate that we will receive net proceeds of approximately $111.2 million, after deducting underwriting discounts and commissions and estimated offering expenses payable by us. We will not receive any proceeds from the sale of Class A common stock by the selling stockholder.

The principal purposes of this offering are to increase our capitalization and financial flexibility, increase our visibility in the marketplace and create a public market for our Class A common stock. As of the date of this prospectus, we cannot specify with certainty all of the particular uses for the net proceeds to us from this offering. However, we currently intend to use the net proceeds to us from this offering primarily for general corporate purposes, including working capital, sales and marketing activities, general and administrative matters and capital expenditures. We may also use a portion of the net proceeds for the acquisition of, or investment in, technologies, solutions or businesses that complement our business, although we have no present commitments or agreements to enter into any acquisitions or investments. We will have broad discretion over the uses of the net proceeds from this offering. Pending these uses, we intend to invest the net proceeds from this offering in short-term, investment-grade interest-bearing securities such as money market funds, certificates of deposit, commercial paper and guaranteed obligations of the U.S. government.

DIVIDEND POLICY

We have never declared or paid, and do not anticipate declaring or paying, any cash dividends on our capital stock. Any future determination as to the declaration and payment of dividends, if any, will be at the discretion of our board of directors and will depend on then existing conditions, including our financial condition, operating results, contractual restrictions, capital requirements, business prospects and other factors our board of directors may deem relevant.

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CAPITALIZATION

The following table sets forth our cash and cash equivalents and capitalization as of December 31, 2011:

You should read the information in this table together with our consolidated financial statements and related notes and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” appearing elsewhere in this prospectus.

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The outstanding share information in the table above is based on no shares of our Class A common stock and 52,773,181 shares of our Class B common stock (including preferred stock on an as-converted basis) outstanding as of December 31, 2011, and excludes:

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DILUTION

If you invest in our Class A common stock, your interest will be diluted to the extent of the difference between the initial public offering price per share of our Class A common stock and the pro forma as adjusted net tangible book value per share of our common stock immediately after this offering. The historical net tangible book value of our common stock as of December 31, 2011 was $31.0 million, or $1.83 per share. The pro forma net tangible book value of our common stock as of December 31, 2011 was $31.0 million, or $0.59 per share. The calculation of historical and pro forma net tangible book value includes deferred offering costs of $1.3 million associated with this offering as of December 31, 2011. Pro forma net tangible book value per share represents our total tangible assets less our total liabilities, divided by the number of outstanding shares of Class A common stock and Class B common stock, after giving effect to the pro forma adjustments referenced under “Capitalization”.

After giving effect to (i) the pro forma adjustments referenced under “Capitalization” and (ii) receipt of the net proceeds from our sale of 7,100,000 shares of Class A common stock at the initial public offering price of $15.00 per share, after deducting underwriting discounts and commissions and estimated offering expenses payable by us, our pro forma as adjusted net tangible book value as of December 31, 2011 would have been approximately $127.2 million, or $2.12 per share. This represents an immediate increase in pro forma as adjusted net tangible book value of $1.53 per share to our existing stockholders and an immediate dilution of $12.88 per share to investors purchasing Class A common stock in this offering.

The following table illustrates this dilution on a per share basis to new investors:

If the underwriters exercise their option to purchase additional shares of Class A common stock in full, the pro forma net tangible book value per share of our Class A common stock and Class B common stock, as adjusted to give effect to this offering, would be $2.33 per share, and the dilution in pro forma net tangible book value per share to investors in this offering would be $12.67 per share of Class A common stock.

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The table below summarizes as of December 31, 2011, on the pro forma as adjusted basis described above, the number of shares of our common stock, the total consideration and the average price per share (i) paid to us by our existing stockholders and (ii) to be paid by new investors purchasing our Class A common stock in this offering at the initial public offering price of $15.00 per share, before deducting underwriting discounts and commissions and estimated offering expenses payable by us.

The total number of shares of our Class A and Class B common stock reflected in the discussion and tables above is based on no shares of our Class A common stock and 52,773,181 shares of our Class B common stock (including preferred stock on an as-converted basis) outstanding as of December 31, 2011, and excludes:

The sale by the selling stockholder in this offering will cause the number of shares held by existing stockholders to be reduced to 52,723,181 shares, or 88.1% of the total number of shares of our common stock outstanding after this offering, and will increase the number of shares held by new investors to 7,150,000 shares, or 11.9% of the total number of shares outstanding after this offering.

To the extent that any outstanding options are exercised, new options are issued under our stock-based compensation plans or we issue additional shares of common stock in the future, there will be further dilution to investors participating in this offering. If all outstanding options under our 2005 Equity Incentive Plan and 2011 Equity Incentive Plan as of December 31, 2011 were exercised, then our existing stockholders, including the holders of these options, would own 89.7% and our new investors would own 10.3% of the total number of shares of our Class A common stock and Class B common stock outstanding upon the closing of this offering. In such event, the total consideration paid by our existing stockholders, including the holders of these options, would be approximately $110.2 million, or 50.9%, the total consideration paid by our new investors would be $106.5 million, or 49.1%, the average price per share paid by our existing stockholders would be $1.78 and the average price per share paid by our new investors would be $15.00.

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SELECTED CONSOLIDATED FINANCIAL AND OTHER DATA

The following selected consolidated financial and other data should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our audited consolidated financial statements and related notes, which are included elsewhere in this prospectus. The consolidated statements of operations data for the years ended December 31, 2009, 2010 and 2011 and the consolidated balance sheet data as of December 31, 2010 and 2011 are derived from the audited consolidated financial statements that are included elsewhere in this prospectus. We have included, in our opinion, all adjustments, consisting only of normal recurring adjustments, that we consider necessary for a fair presentation of the financial information set forth in those statements. The consolidated statements of operations data for the years ended December 31, 2007 and 2008, as well as the consolidated balance sheet data as of December 31, 2007, 2008 and 2009, are derived from audited consolidated financial statements that are not included in this prospectus. Our historical results are not necessarily indicative of the results to be expected in the future, and our interim results are not necessarily indicative of the results to be expected for the full year or any other period.

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