Billionaire Mark Zuckerberg spread his wealth around in a very big way last year.  Zuckerberg, Facebook's Chairman and CEO and his wife Priscilla Chan were America's most generous givers in 2013.

Zuckerberg and his wife donated 18 million shares of Facebook stock in December of 2013 to the Silicon Valley Community Foundation.    That donation was worth more than $970 million, according to USA Today.  They were number one on the Chronicle of Philanthropy's list of "2013's 50 Most Generous Americans."

Forbes lists Zuckerberg's worth as $19 billion as of September 2013 but he's probably more than that now thanks to rising stocks.  Pretty incredible for a 29 year old college drop-out.

To make the list, donations had to be at least $37.5 million.  All and all, the top 50 on the list made donations last year totaling $7.7 billion.  Another $2.9 billion was pledged.