Meet the 10 most generous billionaires in the world

Mark Zuckerberg: Mark Zuckerberg is one of the youngest self-made billionaires in the world. The Facebook founder signed theGiving Pledge. He promised to share at least half of his wealth in his lifetime. He has already donated $1.6 billion. Last year, Zuckerberg and his wife Priscilla disbursed $25 million to help fight Ebola.