I would have to call the cops at least 5 times a day then. And trust me they do not care about 1 singular case of Internet harassment. They need to see a lot of it, spanning months and multiple people for it to even remotely matter. I get harassed by men on a daily basis, you learn to just ignore them. 
I do, however, take screenshots of their faces and what they say to me and publicly post them to warn everyone on my friends list what said person is like. I have helped many many girls avoid terrible people doing that before. The sad fact is that's all you can really do. You can report them to facebook, but they don't really care. You can call the cops and say this guy has harassed me once and they won't care. It's sad, but true.