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Facebook founder Mark Zuckerberg and his wife Priscilla Chan have been named joint top US philanthropists for 2013. The couple gained the accolade after a donation of 18 million Facebook shares to a Silicon Valley foundation.
The donation, worth more than $970m (£590m), was the largest in the US in 2013.
The gift outstripped philanthropists such as
Bill and Melinda Gates, the Chronicle of Philanthropy said.
Mr Zuckerberg and his wife made the $970m donation to the Silicon Valley Community Foundation, a charity that manages and distributes charitable funds.