Six Degrees of Kevin Bacon is a parlour game based on the "six degrees of separation" concept, which posits that any two people on Earth are six or fewer acquaintance links apart. Movie buffs challenge each other to find the shortest path between an arbitrary actor and prolific character actor Kevin Bacon. It rests on the assumption that anyone involved in the Hollywood film industry can be linked through their film roles to Bacon within six steps. The game requires a group of players to try to connect any such individual to Kevin Bacon as quickly as possible and in as few links as possible. In 2007, Bacon started a charitable organization named SixDegrees.org.