Mark Zuckerberg at Startup School 2013

In December 2012, Zuckerberg and his wife Priscilla Chan announced they would give the majority of their wealth over the course of their lives to "advancing human potential and promoting equality" in the spirit of The Giving Pledge.[7] On December 1, 2015, they announced they would give 99% of their Facebook shares (worth about $45 billion at the time) to the Chan Zuckerberg Initiative.[8][9]