Facebook founder Mark Zuckerberg led the way on the giving list for U.S. philanthropists, gifting a Silicon Valley foundation with nearly $1 billion along with his wife, Priscilla Chan.

Zuckerberg, 29, who founded the social media website while a student at Harvard, offered the Silicon Valley Community Foundation 18 million in Facebook shares, totaling about $992 million.

The youthful social media pioneer joins 14 other big ticket donors in the U.S., including outgoing New York City Mayor Michael Bloomberg and businessman and political activist David Koch, who were among those giving away at least $100 million of their fortunes at one time, according to the Chronicle of Philanthropy, which released its annual charitable giving list Wednesday.

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