The most I give out is my chosen name (because my real name is very uncommon and the chosen one is because I'm transgendered) my age, gender. I explained what I like and hobbies/dreamjob. And that I go to school. Which narrows that down a lot -sarcasm-
You too? I've only met one other transgender person in-game, it feels good being able to connect with others who share your "problem". As for me, I went through all the surgeries, therapies and the name change, so I'm "officially" a guy since three years ago.
Right, back on topic, I have to with everything being said. Such information is confidential and belongs to you and only you. Whatever you do with it and the consequences it brings about are your responsibility. Although I'm still a bit concerned about how to warn children about not doing these things online. Perhaps a "must" read through rules agreement text box before being allowed to enter the game might help?