At a Glance: Biggest tech donors in 2013

Facebook CEO Mark Zuckerberg and his wife Priscilla Chan, a pediatrician, topped the list of the most generous American philanthropists in 2013 with a donation of 18 million shares of Facebook stock that are now worth more than $1 billion. According to the Chronicle of Philanthropy, it was the largest charitable gift on the public record in 2013. On Friday, they announced a $120 million gift to the San Francisco Bay Area public school system.

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