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Decreasing signal-to-noise ratio is a common enough issue in all sorts of (specially Internet) places.
I remember when I read almost all of usenet news in an hour a day. It is a long time since I could do that.
Since then, many other group mechanisms have gone somewhat the same way, including email lists, some IRC channels, bulletin boards, user groups, conferences, etc.
The increasing noise (or lower average perceived quality) is likely to continue to happen as more people discover an individual forum, particularly if it is a good quality one.
As people gravitate towards it, the average goes down. The "fix" is for someone to hate it enough to go and setup a new forum.
The alternative fix is to make the "club" exclusive in some way, but that
just slows down the influx.
In reply to Signal to Noise Ratio (wasRe: Ruminations of an ex-PM monk)