Tell-all won’t damage Oprah’s image

You probably read about the unauthorized biography of Oprah Winfrey, which reportedly includes some unflattering and embarrasing stories about Oprah. PR execs told Advertising Age the queen of talk’s image is in little danger. “It will have zero impact,” Nick Ragone, an author and partner-associate director of Omnicom Group’s Ketchum in New York, told Ad Age . “Her brand is Teflon, ubiquitous and so strong that a book like this is not even going to dent it. It’s basically…