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10. (tied) Mark Zuckerberg

Amount donated: $100 million

Beneficiary: Startup: Education

Donor’s background: Mr. Zuckerberg co-founded the social-networking Web site, Facebook, in Palo Alto, Calif.

Mr. Zuckerberg, 26, has pledged $100-million worth of Facebook stock to establish his foundation, Startup: Education, which he plans to donate over five years.

Source: The Chronicle of Philanthropy

Photo: Getty Images