Zuckerberg, other billionaires who have pledged their fortunes to charitable causes

Here is a look at the top billionaires who have signed up for The Giving Pledge

Mark Zuckerberg and Priscilla Chan celebrated the birth of their daughter, Max, with the announcement that they would pledged 99% of their Facebook shares to "advance human potential and promote equality for all children in the next generation."

With the announcement, Zuckerberg becomes yet another name in the growing list of billionares across the world who are giving their fortunes to The Giving Pledge, a joint venture started by Warren Buffett and Melinda and Bill Gates.  Here are the top billionares who have already committed themselves to the pledge.