An internal Justice Departm ent document obtained by the Electronic Frontier Foundation reveals that U.S. law enforcement agents have been logging onto social networking sites in the name of crime fighting. The document gives a brief overview of four popular social networking si tes (Facebook, Myspace, Twitter, and LinkedIn) and how information can be obtained from them. It was the Justice Department who prosecuted a Missouri resident in 2008 for using a fake identity on Facebook to torment a schoolmate. The schoolmate eventually committed suicide after receiving a message from the fake account.
Source: https://www.pcworld.com/article/191688/your_next_facebook_friend_could_be_a_federal_agent.html