Zynga game users buy game credits through PayPal or a credit card to use the games, and the company also makes money by partnering with other businesses that offer services. Although Zynga was founded just three years ago, CEO and co-founder Mark Pincus has grown the company significantly, with more than 1,300 employees internationally and 13 studio offices around the world. Although there haven't been any rumors of a buyout, Pincus has steadily increased interest in his company by selling off shares to private investors. With a rumored valuation of about $5 billion, Digital Sky Technologies, a Russian company, bought $180 million worth of shares in Zynga in 2009. This year, both Softbank and Google bought a combined $300 million interest in the gaming company. So what's in the cards for these gamers — further investment, a buyout or a public offering? We'll just have to wait and see. Jeremy Stoppelman and Russel Simmons — Yelp Inc.