Rather than add yet another piece of commentary on the subject, here are the top three posts I’ve seen covering Ashton Kutcher reaching one million followers, and Oprah Winfrey signing up:
Twitter squarely on the mainstream map – Neville Hobson.
What Ashton Kutcher can teach us about the evolution of media – Neiman Journalism Lab, Matthew Ingram.
Ashton Kutcher and Evan Williams Talk Twitter With Oprah [Video] – Mashable.