What is a fanlisting?

A brief explanation

"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."
... As quoted from TheFanlistings.org. This particular fanlisting is dedicated to uniting fans of the character Gaius from the video game Fire Emblem: Awakening.