Facebook's Mark Zuckerberg Biggest Giver in 2013 Mark Zuckerberg and his wife, Priscilla Chan, were the most generous American philanthropists in 2013, with a donation of 18 million shares of Facebook stock, valued at more than $970 million, to a Silicon Valley nonprofit in December.
Top 10 Gifts of 2013 Show Rebound in Philanthropy Philanthropy made a comeback in large donations in 2013 with the nation's wealthiest donors giving more than $3.4 billion to charity, according to a new tally of the top 10 gifts of 2013 by the Chronicle of Philanthropy.

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