YouTube's Secret Algorithm That Chooses What You Should Watch
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YouTube takes the business of tailoring your search results very seriously. So seriously, in fact, that it has over 1 million lines of code in place to pair up the videos on its servers to you and your preferences.

This video interview with Christos Goodrow from YouTube talks around-without describing in precise detail-YouTube's search algorithms. He explains why videos are no longer ranked by view count-and gives away just a little bit of detail about what they're using instead. [ Computerphile ]