Everyone seems to be digging on Ryan Adams’ new record these days and we can now add John Mayer to the list. But this Twitter exchanged led to a surprise for both guitarists. While Mayer was waxing poetic about Adams’ latest stellar effort Prisoner, calling it “melodic/harmonic gold” and praising Adams for “swimming in his sweet spot.” Mayer related the album to Def Leppard’s Hysteria and when…