[caption id="attachment_21751" align="aligncenter" width="600" caption="John Mayer. 06/17/10 Photo: Drfunkenberry.com Exclusive"][/caption] [caption id="attachment_21750" align="aligncenter" width="600" caption="John Mayer. 06/17/10 Photo: Drfunkenberry.com Exclusive"][/caption] John Mayer returned to Twitter last night to announce he was doing...