The 10 Youngest Billionaires in the World


4. Dustin Moskovitz

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(Kimberly White/Getty Images)

Moskovitz, 28, also knew Zuckerberg from college and worked on Facebook in its early stages. He has since left Facebook to pursue a new start-up, along with charitable work. Forbes estimates his net worth at around $3.5 billion.

Next: 5. Scott Duncan

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