From Evan Williams' twitter, http://twitter.com/ev/statuses/778837244
>> Congrats to @case on graduating from the Goog. Thanks for your work on Blogger. <<

It might be a fake news, because of Valleywag "non-sense of humor" http://valleywag.com/373626/twitter-founder-if-you-dont-like-twitter-youre-a-bitch

Update: It's for real. "Five Years – Next!" http://weblog.vedana.net/2008/04/five-years-next.html