That's stalking. It's not serious now, but talking about the 'next level' sounds really ominous. I'd interpret that as actually physically stalking and/or harassing you and your friends. This needs to be ended as soon as possible.
Alright, I've been in this situation before. I had a super creepy guy stalking me for almost two years. He used to call me and tell me he was standing in my front yard (luckily he wasn't, but still).
That situation resolved itself when I got married. Probably not the rout for you.
I'd suggest going to the police in this case. They may not see this as serious enough at the moment to intervene, but making them aware of it will really help if he DOES start to escalate. Go get it on record that this guy is doing these things, so if they get called later or if it goes to court you have some context. He won't be able to get out of it if you have an official record that he's doing this stuff.
As for the emails and stuff, I don't know that there's really all that much you can actually do. Even if you do get them taken away from him somehow, that doesn't mean he didn't have copies stashed somewhere.
Concerning the account here, unless he's actually harassing you there isn't much anybody will do. If he is actually harassing you, he can be banned. I would suggest talking about this with a dA admin, though.
Yeah, it's not like he's creating alternate accounts to harass me, but he DID create an alternate account pretending to be some girl from the UK and he tried to start up a conversation with me. I knew it was him because of the way that he writes, all of his favorites were the same, AND when he visited me, he came up as my city in my maps, so I knew that it was him. I blocked that account, too.
Thanks for the advice. If this continues for another month or two, I will probably have to file a police report.
That's true, because I literally have dozens of coworkers and friends that know about what happened and what he has told them. Granted, I'm sure he hasn't told them the whole story, either, but they can testify.