Net Worth: $1.15 billion
Source: Facebook
Age: 28

Brazilian-born Saverin co-founded Facebook with Harvard classmate Mark Zuckerberg and for a brief time had a one-third stake. When Zuckerberg quit school to relocate to California, Saverin stayed behind to graduate. A year later Facebook sued him; he countersued. The parties settled with Saverin apparently getting a 5 percent stake and co-founder bio on Facebook's site.