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Left to right: Animals depicted in the FarmVille game shown with Brad Feld, managing director, Foundry Group; Mark Pincus, founder and CEO, Zynga; Reid Hoffman, founder, LinkedIn, and partner, Greylock Partners; Bing Gordon, partner, Kleiner Perkins Caufield & Byers
With more than 235 million monthly users, Zynga rules the nascent world of free online games played via social networks like Facebook. Real purchases of virtual goods, like tractor fuel in Zynga's hit game FarmVille, generate over 90% of the company's revenue, posing a real threat to the gaming businesses of industry giants like Microsoft and Sony, whose consoles depend on players paying cash for games upfront.

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Last updated April 15 2010: 7:09 AM ET
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