I'm not particularly familiar with twitter, but I'd have thought this kind of thing (interests, not porn) would be an obvious application. I mean, I (introvert

I'm not particularly familiar with twitter, but I'd have thought this kind of thing (interests, not porn) would be an obvious application. I mean, I (introverted) am definitely not interested in what my friends had for lunch, but I'd really like to know what book they just finished, or movie, or song. I don't think it would be that hard to separate them by media, and there would be a lot of interesting data to get from this.