Mark Pincus
Net Worth: $ 1.0 billion
Company: Zynga
In 2007 the Wharton and Harvard Business School grad founded social media gaming company Zynga, named after his beloved late bulldog. Today, following the latest round of funding, the firm is worth between $ 7 billion and $ 10 billion. Zynga's staggering success is tied to Facebook's; its popular interactive games, including "FarmVille," "FrontierVille" and "Mafia Wars," are played via the social network, and Pincus is reported to be an investor.