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To the Internet hipsters who discovered Twitter in 2006, Oprah's inaugural tweet - FEELING REALLY 21st CENTURY, she typed - was the end of the era, the shark jump. But that's like saying the Beatles were over after they appeared on "The Ed Sullivan Show."\nTwittermania has only begun. In the days after Oprah's show, Twitter's traffic growth is accelerating. The ratings service HitWise now ranks twitter.com as America's No. 38 Web site. It's about to rocket past CNN and Wells Fargo.