[17] Facebook does not allow users to change their name and their age too often Sometimes, it requires the reason for changing. Line requires the actual phone number to register for an account. Another option that may reduce anonymity action on Facebook is to tag the photo. Because people could tag each other on Facebook, if anonymous users have real-life friends in this/her facebook contracts, they might get tagged on their actual photos
[14]. This situation would announce the real-life identities of anonymous users among those who have never known them before