This applies mostly to man-on-man, but is also good for straight relationships: If you start dating someone you met on the Internet like a dating site and specially social networks; nothing good shall come out of it. (S)He is as much as a whore as you are.
Think about it, both of you met the same way, whoring around in some friend’s Facebook friends. Got it? Good.
Skip it instead and go ask your friend to set you up with someone you haven’t previously seen in his/her contacts, you slut.