Never meet someone from the internet by yourself, is my only advice. Bring someone you trust to help you get out of a bad situation. Oh, and mace (I'm 1/2 joking.)
I actually met someone once, but my parents and their parents went too. It was a lot more comfortable that way, and was only an awkwardfest for our parents lol. I never would meet someone alone.
I met my parnter online. We've been together 10 years now!