Unfortunately I've had experience in this department. The stalker kept following me to various sites, including forums and blogs that I posted on. Every comment I made, they would comment somewhere in the thread and write a lot of nasty things about me. I never did anything about it, eventually they left me alone, I wish I had though. If it's across state lines, I believe that you can report it to your police department just so that they have it on file. Then if something worse happens, there's already a notation on it. I hope that helps and good luck to you.