2 of 6
Eduardo Saverin
Age: 28
Then: Classmate was initially the business manager; he and Zuckerberg were first investors, putting in $1,000 each.
Now: Became estranged over various issues; in 2009 a lawsuit settlement returned his name to list of co-founders.

NEXT: Chris Hughes
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Last updated May 11 2010: 2:01 PM ET