John MayerJohn Mayer may have another breakup coming soon. This time, however, it's not with some starlet or supermodel; it's with Twitter. "Every night for the last two weeks, I think about canceling Twitter. It's over," he declared during Thursday's keynote Q&A at the ASCAP Expo, a three-day conference at Los Angeles' Renaissance Hollywood Hotel held by the performing rights organization for songwriters, composers and producers.

Mayer's relationship with the social networking site has been a very public and devoted one, as he has more than three million followers. But the singer has clearly changed his tune from the days when he would seemingly tweet his every unfiltered thought. "The only positive thing on Twitter is saying 'Thank you'," he said, "and directing [followers] to something cool and important."