US talk show megastar Oprah Winfrey made her debut on micro-blogging service Twitter on Friday with a shout out to her fans. Oprah issued her first tweet around 7:10 a.m. PDT Friday--the same day Williams and Twitter's top celebrity, Ashton Kutcher, will join her on the show.
lets you view Twitter as someone else, with all the Tweets from the people he/she follows. For example you can enter Oprah and see her Twitter stream the way she sees it.