Mark Zuckerberg is the co-founder and chief executive of Facebook, the world's largest social network with nearly 500 million users around the world. The start-up, born in a Harvard dorm room in 2004, has become an essential personal and business networking tool in much of the wired world. As Facebook has matured, so has Mr. Zuckerberg, who was born May 14, 1984. He has traded his disheveled, unassuming image for an ever-present tie while visiting media outfits like "The Oprah Winfrey Show." And he says Facebook's most important metrics are not its membership but the percentage of the wired world that uses the site and the amount of information -- photographs, news articles and status updates -- zipping across its servers. A new movie about the tumultuous origins of Facebook, "The Social Network," opened in October 2010. Facebook strenuously, and Mr. Zuckerberg more quietly, asserted that the portrayal of the company's founding is fict...