This is something one can never stress enough, the importance of not giving out your personal information over the net. Many of you already know of the post put up by SunfallE, but for anyone who missed it, go and read it. It's something you do not want to miss.
You can't stop people from being sickos who will prey on the innocent, but you can do everything in your power to make sure the doors and windows are all locked so to speak.