Is Oprah The Beginning Of The End For Twitter?

Talk-show host's involvement has some worried about the micro-blogging site's future.By Daniela Capistrano Oprah uses Twitter for the first time on Friday Photo: ABC Three years after launching as an innocuous micro-blogging site, Twitter officially has a king and queen. One is a professional prankster and Web entrepreneur; the other is a daytime talk-show host and media mogul. Early Friday (April 17) on her show, Oprah crowned Ashton Kutcher the "King of Twitter" after beating CNN i...

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