Facebook has been highly successful due to its large user base and integration into modern culture. It launched in 2004 as a social network for college students and became publicly available in 2006. By 2012, it had over 1 billion users and its IPO valued the company at $104 billion. Facebook's main assets are its mobile app and Newsfeed, which centralize social content and make the platform part of daily life for many. It generates most of its revenue from advertisements targeted to its huge audience. While competitors like Google+ and Twitter exist, Facebook has remained the most popular social network globally due to its ease of use and central role in how people connect and share online.