From Mediaite:

14. Andrew Breitbart, Breitbart.com

Though he’s not exactly a household name, Andrew Breitbart has long been a power player in the sphere of Internet influence and opinion. The former editor of The Drudge Report, and lead researcher and developer for The Huffington Post, Breitbart has since set out on his own, creating a number of sites that both aggregate and report from what he describes as a center right point-of-view. When Breitbart provided an exclusive interview with Mediate this year, he revealed big plans to grow his “Big” network of sites beyond Big Hollywood and Big Government (which he launched this Fall.) Big Journalism is set to launch next January, with more to follow in the coming year.

But his Internet empire is only part of the reason behind Breitbart’s story — he was ostensibly behind one of the biggest stories of the year: the hidden camera video that revealed government corruption at worst, or horrible management at best at local ACORN offices. This lead to an end of funding of ACORN and a pretty big indictment of both the government-funded program and the mainstream media outlets that ignored the story as well. Which is why Andrew Breitbart is a member of the Mediaite 50.

Check out the whole list here.