I think Peter's worries - "Where oh where are you going TMA?" are probably ill-founded. Since stones seem to attract people who are generally pleasant and not daft I'd say the prevailing nature of the site is pretty good. Occasional spats are inevitable and merely human nature, it's the persistent aggressive or disruptive behaviour that extends beyond a single thread or single week that is the real difficulty - and is easily recognised. Without that there's no problem with TMA at all so far as I can see.