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Re:Reddit overhauls upvote algorithm to thwart cheaters by minimaxir on Wednesday December 07, 2016 @12:57PM (#13124534)
As a proof of concept, I made a simple related subreddit finder using solely the commenting data of users: http://minimaxir.com/2016/06/reddit-related-subreddits/

The "like X subreddit and Y subreddit? Here's Z" is not infeasable to do with ALS on a similar dataset, but requires a better computer than I have. :p

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