I'm so fed up of seeing threads being derailed by people crying troll. The mumsnet rules on this are clear; don't engage and report the thread if you are suspicious. But this never seems to happen. I'm sure that a lot of times people are right. But a lot of time, the troll-hunters are wrong too. I'd rather see a few people duped on a fake thread than see genuine posters put off asking for help when they most need it because a handful of people are convinced that they aren't telling the truth.
But there doesn't seem to be any real sanction for troll-hunters. How about a three-strikes-and-you're-out kind of thing. Not permanently but maybe account blocked for 24 hours or something. Anyone else agree?