I am a very private person online although I come across as being quite the opposite.
I reveal a lot about myself, but not as much as I could, so the chances of someone making the connection with me in any of my online personas is very slim.
I got my full, real name published in an popular australian newspaper in relation to my website - which my name doesn't appear anywhere on and I was very pissed off. but that was a while ago now and nobody ever mentioned it, so I think I'm safe.