Fanlistings are just a fun idea of something to add to your site and a way to collect fans in one place. The concept was created to join together fans of certain subjects, as a way of creating tighter fandom communities.
A fanlisting is, quite simply, a listing of fans of a particular subject, such as a TV show, actor, or musician, that is created by an individual and open for fans from around the world to join. There are no costs, and the only requirements to join a fanlisting are your name and country. Fanlistings do not have to be large sites (although some are); they are just a place where you can sign up with other fans.