Interesting story on TIme.com from the Hitwise folks about Twitter demographics.
I figured that the service would appeal exclusively to youngsters with nothing better to do. The user data, however, tell me I'm wrong, and reveal a very specific user profile: for example, males make up 63% of Twitterers, specifically males from California, whose residents account for more than 57% of Twitter's visitors. More interestingly, the age demographics of Twitterers show a dramatic shift. When the site became popular in early 2007, the majority of its visitors were 18-to-24-year-olds. Today the site's largest age demographic is 35-to-44-year-olds, who make up 25.9% of its users. [Even Gen X is aTwitter - TIME]