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.
eBay founder Pierre Omidyar and his wife, Pam, pledged $50 million in 2009 to fight poverty and improve schools in Hawaii.
They have also agreed to be a part of Warren Buffett's group of billionaires who agree to give away at least half of their net worth.
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Last updated December 14 2010: 8:44 PM ET