Scary thought of the day: Ashton Kutcher has about 860,000 followers on Twitter. Kutcher himself says he's a little startled by the number—"that's a little crazy"—which makes him No. 3 in terms of followers. Nevertheless, he's issuing a challenge to No. 1 CNN (about 923,000) and says he'll be the first to 1 million, ABC News reports. If he wins, he promises a doorbell prank on CNN founder Ted Turner. The sleeper at No. 2? Britney Spears.