Facebook co-founders Mark Zuckerberg and Dustin Moskovitz have pledged to give away half of their fortunes to charitable causes. The Giving Pledge is a philanthropic effort initiated by Bill Gates and Warren Buffett that began in June and now includes 57 generous donors, including Ted Turner, George Lucas, and Michael Bloomberg. In a statement, Zuckerberg, who recently donated $100 million to the public school system in Newark, N.J., said, “People wait until late in their career to give back, but why wait when there is so much to be done?”

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