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FILE - In this Feb. 12, 2013 file photo, actors Mila Kunis, left, and Ashton Kutcher, right, look at a mobile phone as they sit courtside together at the NBA basketball game between the Phoenix Suns and Los Angeles Lakers, in Los Angeles. Kutcher is included on a long list of celebrities who _ at one time or another _ have taken a break from Twitter. Twitter burnout among celebrities, athletes and shameless self-promoters poses a risk to the company and its investors as Twitter Inc. prepares for its Thursday, Nov. 7, 2013 initial public offering. (AP Photo/Danny Moloshok, File)