Amount donated in 2012: about $498.8-million
Beneficiary: Silicon Valley Community Foundation
Background: Mr. Zuckerberg co-founded Facebook, and Dr. Chan is a pediatrician.
Mark Zuckerberg, 28, and Priscilla Chan, 27, gave 18 million shares of Facebook stock, valued at about $498.8-million, to the Silicon Valley Community Foundation to support education and health programs.
This is the young billionaire’s second large donation. In 2010, he pledged $100-million to establish Startup: Education, a foundation to support programs working to improve public schools in Newark, N.J.