On a more controversial note, there was a program on TV a while ago about identity thieves using Facebook to, as you may expect, steal identities.
Quite simply, accepting somebody as your "friend" will automatically reveal your real name, your age, your date of birth if you have made it public. This would be fine if they didn't enter this sort of classified information, or didn't accept people they didn't know as their "friend", but, unfortunately they do.
Once that information is gathered, the thieves could shockingly gain access, through further illegal methods, to bank details etc.
That, along with a fear of excessive large public places, is my primary reason for not bothering with an account on any internet social networking site.
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