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Top 10 Billionaires Who Have Signed The Giving Pledge [PHOTOS]

Some of the richest people in the United States have joined The Giving Pledge started by Bill Gates and wife Melinda, and Warren Buffett in 2010. Till date, at least 93 billionaires have pledged to give away at least 50 percent of their wealth to charity during their lifetimes or upon their deaths. Nov 29, 2012