7. Eduardo Saverin
Worth: 1.6 billion
Background Info: For a brief time he had control of one third of facebook, which then fell to 30% when Zuckerberg's roommate, Dustin Moskovitz, joined. When the others dropped out of school to relocate to California, Saverin stayed behind. A year later Facebook sued him for allegedly interfering with business and insisting on keeping a 30% stake; Saverin countersued. The parties settled, with Saverin apparently getting a 5% stake and a co-founder bio on Facebook's site.