If it is occurring on FB, block him and be sure your FB page is set to private. If he is communicating on there to you through mutual friends, message them and let them know that you need to drop them as FB friends due to it.
If he is communicating to you through email, mark them as spam, or if you use gmail, set filters so messages from him go to the trash. If need be, get a new email address.
If you both go to forums, block him on the forum.
The worst thing you can do is engage him in anyway. Don't do it, no matter what he says to you. If you engage him, you are giving him power..don't do it.
This is a really great site datingasociopath.com/2013/03/07/top-15-sig
The Recovery and Healing section has a lot of great tips to get over/deal with someone who is causing you pain.
I used to think "Clean Eating" was devouring cupcakes while mopping the floor.
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