Facebook is currently the world’s most popular web site, with more than 1 trillion page views each month. Facebook Inc. is a social networking company founded by Mark Zuckerberg and his Harvard mates. Facebook was founded on February 4th, 2004. As of 2015, Facebook posted that it has 1 Billion registered users. Facebook went public on February 1st, 2012. As of 2015, Co-Founder Mark Zuckerberg is the Chairman and CEO while Sheryl Sandberg is the COO.