How much do billionaires give?

In June, Warren Buffett and Bill and Melinda Gates challenged the nation's billionaires to give away at least half of their net worth. Here's how 9 big spenders dole out their money.

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Oprah Winfrey
Oprah Winfrey
Oprah has given $40 million to start a school for girls in South Africa.

NEXT: J.K. Rowling
Last updated December 14 2010: 8:44 PM ET
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