Celebrity Twitterer of the Day

In joining Twitter late Tuesday, Betty White has officially cemented her place in pop culture history. While clearly timed to promote her new NBC show (Betty White's Off Their Rockers, which premieres tonight), White is a most welcome addition to the Twitterverse: "Hey @RyanSeacrest -- my new show airs tomorrow and I hear we're in the same time slot. I've always dreamed of sharing a night with you..." [@bettymwhite]