It occurs to me that the one place I don't mind posting is plan_survive, because it has an explicit agenda that flaming and sniping is Not On. There are two moderators; they've only had to intervene a couple of times ever, probably because of the strongly-stated agenda-against-flaming in the profile. It is fairly narrowly-focused on parenting, however.

Right now I could do with a plan_survive for politics, because I'm simultaneously really interested right now and utterly demoralised by the virulence of any political discussion online. It would be nice to have somewhere where polite disagreement was the expectation, not point-scoring and abuse.