Years ago, any time there was an Apple announcement or keynote, you could get a live stream of the event from Apple.com or you could go to an Apple store that had a theater and watch the event with other Apple fans. Apple cut off the streams, shutting out those who were not invited to see the events live.
Steve Gilmour is all sorts of crazy about Twitter’s IM features. He spent a third of the time he had with the guys from Twitter at IM Not Coming Soon and Gilmour’s overblown reaction Twitter to IM: Drop Dead.
I’ll note that even in the official status post, they state that IM is possible using the Twitter API.