Soggy nailed it!
When a thread begins to stray from the topic at hand, you can pretty much bet that it'll be nuked. Also, among threads that get nuked:
Poor grammar usage and spelling.
Noise.
Flaming.
Repetitive threads (i.e., stuff that's been discussed many times before.)
Thread topics that are inconclusive of the subject matter, such as this one.
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Neil
Pittsburgh, PA
www.geocities.com/neildeweese