Share 'Twitter's tipping point - Is it the beginning or the end?'

CNN asks - As Ashton Kutcher becomes the first to collect 1 million followers on Twitter and Oprah Winfrey sends out her first tweet, tech observers are debating: Does Friday mark a new peak for the microblogging service? Or the beginning of its demise? What do you think? Is it going to become a celebrity press machine or is it just going to be a new way to communicate?