No. 12: Arianna Huffington
In 2005, the author and political journalist launched blog-newspaper The Huffington Post, which now averages 7 million visitors a month. The Web site covers breaking news, politics, entertainment, media, business and lifestyle. There are hundreds of blogging contributors, including Alec Baldwin, Deepak Chopra, Russell Simmons and Bonnie Fuller. Last year, Huffington, mother of two daughters, published Right Is Wrong: How the Lunatic Fringe Hijacked America, Shredded the Constitution, and Made Us All Less Safe. She is a frequent guest on talk and news shows.