As I understand it from what's been said in the past, the moderators (when they are around) can suspend a poster but can't pull threads. Nobody else can suspend, there isn't a way to do it, but everyone can report. Today someone described a robot programme (if Ed's not there), which spots if the same poster posts rapidly within a few minutes more than 5 times, which is how (I think) some of the trolls tonight got knocked off within seconds - there must have been a mass of us hitting "report" as soon their posts popped in. I know I was.