That may be your problem right there. Every time I follow a Twitter link, trying to track down the context and preceding/following conversation thread is like pulling teeth. I don’t doubt that veteran Twitterers or Tweeters or Twatters or whatever find it second nature, but you should really not be using it as an example of how to do anything that isn’t Twitter, particularly when there are plenty of perfectly functional forum models already in existence.
Re: “astonishment is in the eye of the beholder”–well, yeah, that’s kind of the point. If your beholders are astonished, you’ve done something wrong, because your job is to make the beholders comfortable, not cram them into some imaginary objective standard.