Joe and Rika Mansueto at their home in Chicago on May 9, 2008. (Handout)

Another 17 U.S. billionaires, including Facebook co-founders Mark Zuckerberg and Dustin Moskovitz as well as Morningstar’s Joe Mansueto, have pledged to give away at least half their fortunes in a philanthropic campaign led by Warren Buffett and Bill Gates.

A total of 57 billionaires now have joined The Giving Pledge, which was launched by Microsoft founder Gates and investor Buffett in June. The campaign announced the new pledges in a statement late Wednesday.

Gates, his wife Melinda, and Buffett have asked U.S. billionaires to give away at least half their wealth during their lifetime or after their death, and to publicly state their intention with a letter explaining their decision. Get the full story »