Don't get so excited. I have no idea exactly what those people will do next, but a pattern is emerging, and it is interesting.
Dang, I really don't think I should say any more. Use mail if you want advice.
The thing is that in any case it's unacceptable in this day and age. Such behavior should be shut down as harshly as possible.
It'd still freak me out though. Who does stuff like that without being a nutjob? I'd feel the same hesitation before reporting it, I'm glad this guy did.
BTW - I was reading your homepage even before I even saw your post. Great job. Thanks for your service!