Fanpop
These days I find myself spending a lot of time on Fanpop, a network of user-generated fansites for different topics of interest created and maintained by the community of fans. Fanpop is a charming community and I find the interaction on the fan spots and between the fans truly addictive.
The first fan spot I created -- way back in the summer of 2006, is dedicated to heavy metal. The poll below is part of that spot.