21 Richest Billionaires In The World

20. Warren Buffet

Facebook CEO Mark Zuckerberg talks about the new Facebook email service at an announcement in San Francisco, Monday, Nov. 15, 2010. AP Photo/Paul Sakuma)
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Rating: $74.4 Billion

The "Wizard of Omaha" was the most successful investor of the 20th century and was voted one of the world's most influential people by Time magazine in 2012.

Astonishingly he has pledged to give 99% of his fortune to charity.

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