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The founder of Facebook, Mark Zuckerberg, is to join the ranks of global philanthropists. But he's been warned he'll need to be careful about how they spend their billions, if they want to make a lasting impact. He and his wife Priscilla have celebrated the birth of their daughter, Max, by announcing plans to donate most of their fortune to charity. Our Business Editor, Kamal Ahmed, assesses Mr Zuckerberg's ambition. (Photo: Mark Zuckerberg. Credit: Mark Zuckerberg via AP)