Singer John Mayer has criticized Country music star Taylor Swift's song 'Dear John', saying it made him feel terrible! Wanna know the whole story? Check out the video. Regular Facebook Updates http://www.facebook.com/RajshriDotCom. Twitter Updates https://twitter.com/#!/RajshriDotCom. Watch more http://www.youtube.com/HollywoodNOW for the latest Hollywood News.