The New Face of Philanthropy

Mark Zuckerberg, the 31-year-old co-founder, chairman and CEO of Facebook, recently announced that he and his wife plan to donate 99% of their wealth - approximately $45 billion - to charity. On today's Please Explain, Michael Hobbes, a freelance writer who also works for a human rights NGO, talks about how philanthropy is changing, from the Rockefeller and Carnegie foundations, to Bill Gates and Mark Zuckerberg's altruism.  Do you have questions about philanthropy? Send us your questions in a comment below, or let us know on Twitter or Facebook!