I involved the police. Bullying and harassment are still bullying and harassment over the internet, so I printed off the emails I was getting and the places online that I could see this person calling people to action to harass me and brought them to the police station. I explained what was going on, and the police called them to explain that I had filed a complaint and that things could go further if they didn't stop. Things calmed down after that.

If it's happening on a specific site or social platform, involve the admins of that site/platform. Especially if it is being done anonymously, they may have access to information you don't have about this unknown person, and they may be able to save that evidence and document it in case it later escalates to the point where police involvement would happen.

If it's merely annoying behavior, you might not be able to do more than just ignore it. Don't reply at all, not even to refute insults.

If it's at a higher level, such as stalking or threats of any kind of harm, certainly involve the police.

Ok. I already blocked the person on the social media site.. I'm going to change my cellphone number and block his number. It seems to have calmed down when I threatened to call the police.

Thanks for the tips. I just was kind of in a panic.. bad break ups are bad and he wouldn't leave alone. He kept saying hurtful things and then talking about how he still loved me. Hopefully he's gone for good.

In general: Turn off the computer and go outside. Just remember that people are always tough from behind a monitor and a moniker, but if they can't say it to your face then they are showing you just how pathetic they really are.

In your case (ex-bf and all that) Record it with screen shots, etc. so that if anything happens, or if he goes any further you have proof to back your story up. Depending on the kind of girl you are, you can either hand it over to the cops for a criminal harassment or see your ex put into the hospital by a group of friends with questionable morals