There is an art to a Letterboxd movie review. Sure, you can use the film-based social network to log what you see, or to write straightforward film criticism. But a lot of the most entertaining reviews on the app are closer to clever tweets or stand-up comedy riffs than the works of Manny Farber or Parker Tyler. As a dedicated Letterboxd user (a dedicated patron in fact), I love reading these reviews (and writing them myself). Sometimes I send funny reviews I come across to friends, but what’s really fun is to remove the title from a review and see if someone can correctly guess the movie the …