Yes. Celebrities are tweeting. In many cases it’s not really the celebrity themselves, but probably their assistant. None the less, they are on there.
Since June 2009 Twitter has added the “Verified Accounts” certification to high profile Twitter users. This is an attempt to derail the celebrity squatters (people who steal your name). Although if you are a celeb and not on Twitter you are really failing IMO.
In recent news Ashton Kutcher reached 1 million followers. He tweets a lot about politics too if you are in to that. My favorite is Shaq.
Here’s one reason why.
To find out which celebrities are tweeting go to Celebrity Tweet.