It looks as if Biz Stone (aka @Biz) just revealed that Twitter has over 100 million users while presenting some brief stats at Chirp (Twitter’s developers conference) which users can watch live via Justin.TV.
For comparison, Facebook has over 400 million users and MySpace (according to Quancast) has 185 million users.
Twitter also mentioned that 75% of their traffic comes from outside of Twitter (as only 1 in 4 users actually visit and use Twitter.com). This may explain why Twitter decided to acquire Tweetie as well as partner with RIM to launch the Official Twitter Blackberry app (before recanting “its officialness“).
Currently (as I type) Evan Williams (@Ev) is on stage explaining the history, background and culture of Twitter, as well as the overall infrastructure of Twitter (a talk that may appeal more to geeks than to the average blogger).
