I got hit by a panic attack last night in case this idiot is one of the people we've PPCed before. I don't think it is, because the ones I've seen would have the sense to at least restrict their flaming to us and not to random twelve-year-olds, and I don't think any of the ones we've done have anything to do with 4chan.

Please reassure me? Tell me a way to counter-argue if it is and this crosses over into a real-life mess?

I was sleep-deprived when it occurred to me, but still ...

You could probably report it to either. One thing you should find out first is whether the UK has laws based on internet harrassment. It's likely they do in this day and age. You can try contacting them, and the mods, first. If they say go chat up the US folks, do that.

I know for sure the US has federal laws about harrassment on the internet; I was the subject of it once. My dad went a little trigger-happy and wanted them arrested because they could have been. It's pretty serious, so I'm sure wherever you go they'll take *you* seriously.

Also, if you have any screencaps or downloaded evidence of this guy, or if anyone else does, it would be good to keep handy and present it. The more hard evidence the better. The mods might be useful for that.