Face ..FACEBOOK .... the sponsored adds on FB is a most strongest tool there to collect fans and members,
i have 3 group and 6 page there at FB and i use those sponsored adds promote them, and i can tell you i have gotten more than 3,000 (overall) between members and fans there.
wanna check one or two of those Groups and Pages ..here are the links.
http://www.facebook.com/groups/solostudio/ (My Studio Group)
http://www.facebook.com/groups/157994290933780/ (an Egyptian Musicians database, which i published 1 year ago) it help 100s of musicians to create their own bands and projects.
at the end do not underestimate those Facebook sponsored adds.