Teens and Twitter

Following Matthew Robson's comments on teens' antipathy to Twitter Techcrunch has further debate. According to some the antipathy is due to concern for privacy: Twitter can't be as closed as a group of Facebook friends (I'm not sure I buy this). For others it's simply that teens are not interested in news, but like stories about themselves and their peers, supported by photos, comments,links etc. that can't be achieved by the more linear Twitter (this (and cost) is more compelling for me).