Singer-songwriter extraordinaire John Mayer left his 3.7 million Twitter followers in September 2010, having previously been one of the most avid celebrity tweeters out there. He signed off with the witty message ""What does this button do?", and later revealed he quit the service as his tweeting was affecting his songwriting.
Mayer said: "I stopped using Twitter as an outlet and I started using Twitter as the instrument to riff on, and it started to make my mind smaller and smaller and smaller. And I couldn't write a song."