Fifteen year old Matthew Robson explained in a now-famous Morgan Stanley research note why teenagers don't use Twitter (and neither should you): They actually realize nobody reads their tweets. Before you start to argue, just enjoy the miracle of youth. The kid knows intuitively what adults need extensive research and essays in the Harvard Business Review to point out. OK, now you can argue. Just check out those links first.
Bonus Points: If you had gotten $50 million of free advertising coverage, you'd be popular too.
Leaked internal Twitter documents show the company projects a billion users by 2013. I assume what they mean is a billion sign-ups, not actives.
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