A sudden surge in celebrity tweeters has given a huge boost to Twitter, the micro-blogging service that offers up the world in 140-character chunks.
Last Friday, after media maven Oprah Winfrey sent her first tweet during a live broadcast, Twitter saw its share of U.S. Internet visits increase by a remarkable 24 percent, according to the industry analyst firm Hitwise. The company also found that visits to the Twitter site were up 43 percent over the previous Friday.
Oprah’s decision to join…
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