Dave Winer has more thoughts on the “Twitterlike is a bad shape” post:

Each decision we make in developing our means of discourse shapes the discourse. And with the character limit and the inability to edit, and the incentives are all wrong (I can tap into your follower flow without your permision just by posting a reply) and makes almost all discourse spam or abusive or both. I’m planning a different structure for discourse in the World of WordLand.