John Mayer was back in the studio and on the road as he stayed busy with his fourth album, Battle Studies. He took time off to honor Michael Jackson, but attention was soon back on John and his love life. There was speculation John was planning to reunite with Jennifer Aniston, but the rumors soon shifted over to Taylor Swift. It was his former romance with Jessica Simpson, though, that derailed John's whole year when he referred to her as "sexual napalm" in a Playboy interview that caused a major scandal. The fallout from that misstep caused John to reconsider his whole approach to the press, and he's even threatened to permanently quit Twitter.