I've seen this subject come up here before and I'm afraid to say I think people are far too paranoid about it. I use Facebook, Twitter, Instagram etc. and mostly register with my real name. I post pictures of myself, usually with celebs that I meet at conventions. I also enter many online competitions where I have to fill in my name, email address, postal address, date of birth and phone number. So what's the worst thing that can happen if a stranger knows my birthday - they send me a birthday card? Obviously it's not a good idea to post details of when you're away from home etc. but most of these other things can be obtained from phone books, electoral registers etc. What harm can it do as long as you don't post financial information etc.