They are trying to prevent other fake identities. A life can easily be destroyed from one fake account on Facebook or any other social site because an enemy could use a friend’s name and find out something really personal and spread it to people who shouldn’t know. Online bullying is awful and most of the time, it does start from a fake account. If someone has to make up a fake name or take up somebody else’s identity, then obviously the things they are aiming to do or say aren’t necessary.