Facebook, Twitter etc. should not allow people who’s basic profiles, especially their profile picture, have not been completed, to go public. There are too many Trolls about and others, not who they are pertaining to be, on social networks. If you do not want people to know who you are, then what are you doing on a “Social” network, embrace or GT*OOH. If you are a Troll then please have the decency to put a nice Troll picture for your profile, as per example, at least then we know who you are! Please share!
PS-does anyone know if there is a “tongue in cheek” favicon that I can use? ;-)