I don't understand the confusion over what happened on the spin off forum last weekend. But to clarify ...
A poster proudly announced (on R) that she had worked out the real life identity of a well known poster on Mumsnet. This poster obviously exists (or else where would all the typing come from?) but is thought to be a troll at worst a fantasist at best.
The op of the thread on the other forum concluded that she was a fantasist rather than entirely fictional. She posted in great detail about the real facts of this persons life and pointed out where this differed from the embellished version that has been documented on Mumsnet over the past few years.
There followed a lot of on thread speculation and clues/guessing about who this real life fantasist is and when it looked like it was getting close to a doxxing situation the mods stepped in and deleted the thread as no doxxing is supposedly the only rule over there.
My theory is that the whole thing was only posted on that particular evening to take attention away from the flouncing, infighting, and accusations of trolling amongst their own members which had been dominating the weekend up until that point.
The R solution to trolling appears to be ignore it and hopefully it will all go away. Anyone who does any troll hunting on there gets down voted so that their posts disappear.
As for Mumsnet, I really don't think that troll hunting is a bigger problem than trolling and doubt I ever will - no matter how many of these threads get started.