Sysomos published a fascinating report regarding the demographic make up of people who use Twitter. (h/t The New York Times Caucus Blog.) Some key findings from the report’s summary:
Women make up 53% of users New York has the greatest number of users, followed by Los Angeles 72.5% of all users signed up during the first five months of 2009 93.6% of all users have less than 100 followers
The Sysomos survey report can be found here.