That's not to defend what Facebook has been doing. The company operates the world's largest social network, with more than 400 million registered users. Collectively, these users pour data about themselves onto the site faster than BP spewed oil into the Gulf of Mexico. But people flock to Facebook in order to share information with a select circle of friends, not necessarily with the entire wired planet. Contrary to their expectations, Facebook has gradually exposed more and more of their profiles, photos and other postings to the public at large. It also launched a program to share personal information with other websites unless users instructed the site not to do so.