JOHN Mayer may not be lucky in love, but the guy know how to write the kind of heartfelt lyrics that make women swoon. Just three weeks after his break-up with Jennifer Aniston, John has debuted a new song of his called Half My Heart. John played the song for people at the VH1 Save The Music Foundation benefit last night. The lyrics include: "Half of my heart is a shotgun wedding to a bride with a newspaper ring/Half of my heart is the part of a man who knows he's never really loved a thing." John didn't share the inspiration behind the song, but let's hope he's not referring to Jen Later that night, John Twittered his thoughts, saying: "That felt great to play again. Half Of My Heart felt pretty good. Gonna tweak it a bit." And speaking of Twitter, John seems to be pretty into it But when asked about it, he replied, "It's inherently silly and it's inherently dumb. "If you really think that Twitter is the pathway to spiritual enlightenment, well...It's one step away from sending pictures of your poop." "I've always communicated at a high level as best I can whether it's Twitter, Napster or message boards or wherever. I don't have a devotion to Twitter. I didn't sell out to Twitter. You do Twitter until everybody gets off of Twitter and it's something else you go and try out." Well for someone who compares it to poop-sharing, John sure does go on pretty often. We think he and Ashton Kutcher are tied for biggest Twitter obsession. - HS