Ashton Kutcher to CNN: Tweet this!

Ashton Kutcher.

Just a few weeks ago, no one was close to reaching that benchmark. Now, as users have flocked to the increasingly popular microblogging site, the numbers have grown.

CNN's breaking news feed leads with more than 937,000 followers as of noon Wednesday.

Britney Spears

is second, with more than 903,000 followers, while Kutcher () has seen his follower count grow to more than 888,000.

The 31-year-old actor has thrown down the gauntlet, challenging CNN and its founder,

Ted Turner.

In a Web video posted earlier this week, Kutcher said he would ding-dong-ditch Turner's house if he beat CNN to 1 million. (Translation: Ding-dong-ditch is when you ring someone's doorbell and run away.)

"I find it astonishing that one person can actually have as big of a voice online as what an entire media company can on Twitter," Kutcher said in a video posted at

. "I just thought that was kind of an amazing comment on the state of our media."

Kutcher later promised a "Guitar Hero" video game to his millionth follower, before quickly realizing it would be difficult to identify such a person.

In postings on Twitter, Kutcher said he was fielding interview requests, including one from CNN's

Larry King

. He was mulling the offers and claiming it was a "saga for the Internet," not TV.

Not to be outdone, King posted a video on YouTube boasting the wrath of his company.

Said King: "Are you kidding? Do you think you can take on an entire network? Do you know how big we are? Do you know what CNN is? Kutcher, you're playing out of your field. You're in another time zone. This ain't gonna work. CNN will bury you!"

Both Kutcher and his wife, actress

Demi Moore

, are popular Twitter users. Kutcher, in particular, is an avid poster of tweets - messages that must be 140 characters or less.

And if you're wondering who's in fourth place, the Twitter feed for

Ellen DeGeneres