Facebook Inc outed itself as championing privacy four years ago when it decided to restrict outsider developers’ access to data about its users’ friends. But confidential documents that have spilled out of a lawsuit filed by a disgruntled developer tell a different story: That Facebook was quietly facilitating the commercial exploitation of user data to bolster its bottom line. And more evidence of Facebook’s marketing of user data may be exposed any day if a member of the UK’s Parliament goes ahead with his promise to release a trove of sealed documents from a US court case. Facebook hasn’t disputed