Change Agent Young Internet entrepreneurs embrace philanthropy

Facebook's Mark Zuckerberg, Twitter's Biz Stone, Craigslist's Craig Newmark, and many others have turned their entrepreneurial skills to solving the world's social problems.

Adam Hunger/Reuters/File

When Mark Zuckerberg, the 27-year-old co-founder of Facebook, announced last year that he was giving $100-million to set up a foundation to help Newark, N.J., public schools, he became one of the highest profile examples of an increasingly common type of big donor: the Internet geek gone good.