I've found that when I find someone who agrees with my thoughts on a film, they're more likely to suggest films that I like in the future.
Idea of an expansion of the Rotten Tomatoes idea: users rate movies fresh/rotten and it uses that data to match them with critics they agree with, using that data to suggest new films.
It's called collaborative filtering
It's the basis of amazon.com recommendations. Like most "algos" - how well it works depends on how good the input data is.
@ada_33 aha, so there is a name for it! Very interesting.
@levisan have you tried letterboxd.com?
@brad I will now!
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