Not really going to get into a debate about it because I won't be changing my mind, but if you think you're anonymous then fair enough.
i fear mostly some people that i know than the guys of CIA, so for me it's enough to be hidden to those people
i know you have to sign in using an email address, but i don't have anything to hide, so this doesn't scare me that much.....the important thing is that i'm anonymous for those i mean to remain anonymous!
@chuck: that's true, there are also some other ways, but email is boring and slow. i don't like messenger, and you must be both online to talk, and this is not always possible, so FB is quite easy to use, you can leave your message and be replied after hours or days.