If you are participating in discussion forums under pseudonym, you quite easily give quite many bits of personal information over time even if you try to be car

If you are participating in discussion forums under pseudonym, you quite easily give quite many bits of personal information over time even if you try to be careful about it. You give hints about your age, where you have lived, maybe about hobbies, education, work history, time when you are online. Each individual bit is not much, but when you combine few of these, they actually identify you exactly.