2012 net worth: $18.7 billion
2011 net worth: $19.8 billion
Google's Sergey Brin saw his fortune drop by $1.1 billion in the past year thanks to a 3% dip in the search giant's stock. While cofounder Larry Page replaced Eric Schmidt as CEO last year, Brin has been heading up special projects, reportedly including a secretive hardware laboratory known as Google X. Another initiative: Google Music.
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