Twitter is totally unsuitable for intelligent discussion. To make a point with nuance requires paragraphs of text. Even a typical forum (looks around) can't really handle the amount of text required to make a satisfying, representative and well rounded argument.

Twitter gets some hate because it can push the vibe of a situation in a weird political direction, but Facebook's overzealous moderation actually stifles something closer to real debate. Also, Facebook is where communities are organising so the bans hurt more.