Well before internet was common place I used packet radio, of course I needed an amateur radio licence to do this, but people can claim to have a licence when they have not, so the people who ran the bulletin boards we called them Sysops or system operators were legally obliged to monitor traffic and reject anything they felt may have jeopardised their licence.
There was in real terms no way they could read every post, so they would monitor a new poster carefully, if no problems then they would just look at random samples, plus a banded word list. However it was hard for them, they wanted to simply pass on the messages, and with no or little delay, at that time hard drives were small, hanging on to a massage needed hard drive size to be increased, often the banded word list would not delete the message, but simply hold it until the sysop could read it.
DIY Doctor still does not allow posts to appear until they have viewed them, it is a real pain, as you can get many people answering a message but you as a user don't know what others have said, and there is a long delay before the poster gets an answer.
Screwfix is the other way, there seems to be very little they do other than remove adverts. However they don't seem to have a problem poster, and in real terms we only have two people who cause problems.
The problem is the desire to get last word can mean threads go daft, I saw it with the Screwfix forum with the post about kWh having nothing to do with hours, yes I started it. However never seen people get so upset. It was intended to be light hearted, however it does point out those who will learn and except they have made an error and those completely fixed in their view and unwilling to learn.
Although the second in watts cancels out the hour in kWh there is clearly a connection with time. In the same way light years may be a distance but we can still see the connection with speed of light and years. However the arguments really got daft. As said Screwfix rarely locks a post. I think they simply remove the thread, which is likely better, as if the last word is wrong, no one can correct it.
Ultimate handyman sysops delete stuff and put a message to say deleted by modulator and which modulated has deleted it. The thread is rarely locked. There is one called "
DIY electrical work and the law" by "[URL='http://www.ultimatehandyman.co.uk/forum1/member577.html?sid=86eefad7b470b46945ce676a7ef30428']ban-all-sheds" [/URL]which is now well out of date "Thu Dec 20, 2007 4:50 pm" which it would be really handy to be able to add to it to say how law has changed, but it is locked last visit by poster was Fri Jun 05, 2009 2:08 pm and it seems he has been banned. So who ever he was he can't change it either. Not really a good idea.
So all in all likely the way this forum is run is on of the best. And I think in general the moderators do a good job. The problem seems to be just two posters. One was OK we could live with it, but two is a real problem, as to how to deal with naughty boys I really don't know. With amateur radio we were told simple switch off your radio, do not reply, if the guy has no one to upset he will go away, we called then IQ0's and yes it worked, but can't really do that here.