As defined by TFL,
A fanlisting is simply an online list of fans of a 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.Simply put, fanlistings are exactly what they sound like: Collectives of people from across the world who share an interest in a similar subject. By joining a fanlisting, you are adding your name to a worldwide registry of people with a shared interest. In the case of this fanlisting, that interest is the planet Pluto.