Ashton Kutcher was crowned King of Twitter on Oprah Winfrey's show Friday no less.

He beat out CNN in reaching a mind-boggling one million followers.

He uses Twitter to rally people around his favorite causes, such as fighting malaria, and to control images and photos of himself and his wife actress Demi Moore.

"There are giant things that we can do through this platform," he told Oprah in this video available on YouTube.

Kutcher shared his thoughts with Oprah on Skype. Natch.

He even got Oprah to start tweeting--so he better watch his back as the Queen of Media could overtake as Empress of Twitter.

Oprah has been a big Skype fan and has used it to reach out to to her huge audience over the past year. I wrote some of my first blog entries about Oprah.

Twitter is growing fast with over 14 million members worldwide. You can follow me there. I'm journotwit, writing about Skype, life as a freelance and college prof, genetics, the changing media, whatever strikes me.

But for the record, Skype is a potent social medium itself, attracting 350,000 new users a day with a network exceeding 400 million.

Social media are big and getting bigger. You better get on the juggernaut before it knocks you over. Where Oprah goes, the mainstream audience is sure to follow from old-fashioned dead-tree books to modern media, such as Skype and Twitter.