Who uses Twitter?
Without access to demographic information, Twitter is for the highly engaged, early-adopter, pro-technology user. This is the ‘influence’ community, meaning they will shape the direction of others in each of their respective lives. It’s highly likely that these users participate in other forms of online publishing and communication like blogging, Facebook, or use mobile activity. In short, it’s the ‘coolkids’ of the webspace, and yes, that includes John Edwards.
So, now I know why all my cool kid friends were telling me to get on Twitter. Man, I hate when they're right ;-)