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 $970 million (Rs 6,005 crore), was the largest in the US in 2013.
The gift outstripped philanthropists such as Bill and Melinda Gates.
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