Facebook's Mark Zuckerberg named top US... Find out

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.