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A 'troll' in the sense of online communications is a term derived from usenet.
Unfortunately, on Metafilter as on any other community, it can sometimes be difficult to distinguish a troll from someone who simply thinks differently.
Nobody is a troll. Everybody is a troll.
Users widely regarded as Trolls on MeFi
Bevets [account disabled]
ParisParamus [account disabled]
Gnostic Novelist [brain disabled]
troll [not actually a troll, in internet terms]