/u/StopReadinMyUsername on reddit combined the average ratings (Critic's & Users) from IMDb, Rotten Tomatoes, Metacritic and Letterboxd, and then weighted and tweaked the results with general film data from iCheckMovies and IMDb to reveal the 1001 Greatest Movies of All Time.
source: http://redd.it/3hbiio
1001 Movies You Must See Before You Die is a film reference book edited by Steven Jay Schneider with original essays on each film contributed by over 70 film critics.
Source: http://en.wikipedia.org/wiki/1001_Movies_You_Must_See_Before_You_Die
