#1 Mark Zuckerberg and Priscilla ChanAmount donated in 2013: $992.2 million
Net worth: $19 billion
Beneficiary: Silicon Valley Community Foundation in San Mateo, Calif.
Background: Mark Zuckerberg is the co-founder and chief executive of Facebook, while his wife Priscilla Chan is a pediatrician. Their latest gift will support programs for children at the Silicon Valley Community Foundation. The couple previously donated $100 million to New Jersey Schools.
(Source: The Chronicle of Philanthropy)