[deadly_syn]

I think SomethingAwful actuslly solves this problem eloquently, people are kes slikely to behave poorly when they pay for an account and have their name with site administration.

Alternatively i think building an invite only community by way of "web of trust" would also mitigate a lot of these issues.

[oxygen_crisis]

I liked how SomethingAwful would let you pay to change other users' profile picture and/or title.

People would routinely change other users' titles to a representative quote from one of their earlier posts so every one of their posts was preceded with an excerpt showing how unhinged/biased/reactionary/etc they were.

[darreninthenet]

IIRC LinkedIn started out as a "web of trust"