“HI TWITTERS. THANK YOU FOR A WARM WELCOME. FEELING REALLY 21st CENTURY.” So read Oprah Winfrey’s first tweet last Friday. Given Twitter’s wild success, the addition of one more devotee ordinarily would not create much of an impact — even a celebrity like Winfrey. However, Winfrey made her Twitter debut on her TV show — another, albeit more established, cultural icon. Traffic to the microblogging site skyrocketed after the broadcast by a whopping 43 percent, according to the market tracker Hitwise.
