Netflix in 2006 held an open competition to find the collaborative filtering algorithm that would best predict whether or not a user would like a particular film or TV show based on previous ratings. The grand prize of $1 million was awarded to a team called “BellKor’s Pragmatic Chaos” in 2009. The team’s algorithm was found to be 10% more effect than Netflix’s own recommendation service, however the company never implemented the team’s solution into its own service. “...