Just like Martha Stewart, and perhaps even more so, media mogul Oprah Winfrey (@oprah) has a legion of fans who hang on her every word. She's created a true empire and the fate of everything from an author's career to a product's success can hang in the balance depending on her recommendation. When Oprah tweets, her nearly 750,000 (as of April 2009) followers listen. Considering the fact that Oprah just started tweeting in mid-April 2009, the sheer number of followers she has is astounding. So far, her tweets have been a mix of updates on upcoming show guests and some fun personal information, like what music she's listening to and what her dinner plans are. She also gives a little behind-the-scenes look at her show, tweeting about how she pulled an episode on the Columbine High School shooting anniversary because it "focused too much on killers." Go, Oprah, go.