eMarketer has their latest projections on Twitter:
Tweety Bird would never believe this.
If media attention is any indication, Twitter has exploded into an all-out phenomenon. Celebrities, politicians, entrepreneurs, business leaders and everyday users are flocking to the service en masse, generating a frenzy of activity and attention.
Everybody is talking about Twitter, but what do the numbers say?
All I can say is that I predicted Twitter would go mainstream last May :) I would estimate that it really didn't go mainstream until winter of 2008 when major media outlets began using it to interact with their viewers. If I only had more time to write my trend pieces :)
"Twitter, Tina Fey, and the Future of Micro-Blogging" Mashable