[Kaguya]

You done the right thing Natsu, you didn't sink to his level and for that you should be proud of yourself. I am another that doesn't give out another person's details unless they have given me permission before hand, because I go absolutely livid when it's done to me. You will be better off without someone like that person around you, as only an immature fool resorts to insults and opening old wounds such as that.

I find in time karma has a way of catching up to people, and with the way that former friend of you acts, I'd say sit back and grab some popcorn because when karma catches up to him it's going to be a doosy of a show. I agree with DK remove and block him as a friend on facebook and if he still continues to harass you report him be it to the site in question or to the police. I would say when he does contact keep a note of when and how and if it's online save the messages or screenshot them to show at a later date, it'll build a stronger case.