Twitter Not for Teens

This isn't really news, demographics have consistently reported Twitter as a 20-30 something phenomenon.

I don't think it's very surprising either.

Twitter is best used as a news aggregator, and teens don't care about news. Also, unlike Facebook, no one will follow you on Twitter if you're not saying something valuable or linking to something interesting. I think teens need the false sense of relevance provided by services like Facebook, where you get to cram your thoughts down the throats of everyone you have ever met.