"Team B used a very simple algorithm, but they added in additional data beyond the Netflix set: information about movie genres from the Internet Movie Database

"Team B used a very simple algorithm, but they added in additional data beyond the Netflix set: information about movie genres from the Internet Movie Database (IMDB)." I had no idea imdb had so much genre data. E.g., a "keywords" page for every movie [http://www.imdb.com/title/tt0062622/keywords http://www.imdb.com/title/tt0062622/keywords] and, for every keyword, maps of (a) related keywords and (b) movies that mention it [c.f., http://www.imdb.com/keyword/metaphysical/ http://www.imdb.com/keyword/metaphysical/]. Very cool.