To me it sounds like one of those anonymous guys. mostly considering how he referred to "a coalition of the willing" basically some of them (not all) are buttwipes that do this kind of thing. gather info on a random target (usually groups like furries, scientologists,AB/DL's) and grief them. truthfully they could have some how found another place you posted gotten the isp and done some look ups to trace the name. the videos and love bug though I do not know how or why they would know stuff like that; (unless they found logs of your ims to someone mentioning these things.)
Basically change all your passwords just in case and forget about it.
anyway hope I helped some