Followers: 45,000
Sample tweet: "'SNL' Books Elton John, Helen Mirren As Hosts."
Los Angeles is hardly a town for the thin-skinned, but few have the ability to strike fear in a starlet's heart quite the way Nikki Finke does. More than anyone else, the woman anointed by Elle as "the sheriff of Hollywood" dictates coverage of show business through her site, Deadline Hollywood. Like her no-nonsense blog posts, her tweets are terse and unforgiving — a stark contrast to the chattiness and snark of most Hollywood tweeters.