Your real name? Learning the real name may be nice. I'm not sure if I would share mine.
Your age? I am fine with saying it one day. I have only twice here mentioned but a false age and I quite regret it. Happy I rid myself of one of them.
Your birthday? I do not mind telling anyone who asks.
Your city of residence? Hmm I might say it sometimes. The past year I've been moving around back and forth from the UK, middle east and to a lesser extent east asia so I've not been content on my staying at one particular place.
Pictures of you? I'm fine showing my picture through certain means.
Your email address? I do not mind telling anyone who asks. I generally use 2 emails.
Your IM username? I barely, if ever, go on IM. I cannot remember mine.