Forums (IMO) are much superior to mailing lists for one simple reason.... If the forum software is a threaded one then it is really easy to avoid reading any drivel from the trolls. You just ignore the whole thread if the troll starts it or just ignore any parts of an otherwise useful thread if it becomes troll infested.
With mailing lists it is easy to just not open a post from a troll but if someone else directly quotes a troll then it is a bit tricky to "stop reading instantly". The trick is that the forum must be threaded. Of course the desperate trolls will then start to put their poison in the subject line and to increase their use of sock puppets so as to try to trick us into reading their garbage. At this point there, unfortunately, needs to be some form of moderation/banning (or CENSORSHIP as the trolls will bleat).
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