Twitter is one of those things where I understand completely how some people could be repulsed by it. Incessant information flowing everywhere, constantly. Most of it by people who have nothing particularly interesting to say.
As somebody who traffics in information though, I have to say I've found it useful -- despite the fact I couldn't understand what it was for initially.
Twitter is dysgenics thats support ADHD. You can't fit anything intellectual into 160 characters.