The random Diablo III poster thing was a spam bot, and IIRC, some such spam bots are rigged to spam with greater ferocity should any unwary user happen to respond to a post they make.
The irony, of course, is the sad state of Diablo III where Silverquest, or most other online RPG games ever even beyond the Korean style clearly being aped, trump it by not going utterly pay-to-win and the other myriad problems it has from Blizzard and Activision going off the deep end.