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America's 10 Youngest Billionaires

Mark Zuckerberg

Net Worth: $6.9 billion
Source: Facebook
Age: 26

The Harvard dropout and Facebook CEO was the biggest percentage gainer on this year's Forbes 400 list and the unwitting star of box-office hit The Social Network. Last month he agreed to donate $100 million to Newark's troubled schools.

(AP Photo/Marcio Jose Sanchez)

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