I would like to add my 2 cents to this. Your answer to somebody that's concerned about revealing his identity is to use his name in a graphic but I don't feel that this solves the problem. Sure it would prevent someone finding your account if he tried searching for your full name but not the other way around. For example: a user is using the same username on multiple websites/forums and someone decides for whatever reason he wants to find out more about this person. He googles the username, finds the link to this forum, opens it and has the full name whether it's typed out in a graphic or plain text.