Netflix
https://www.wired.com/2013/08/qq_netflix-algorithm/
http://www.techradar.com/news/television/how-netflix-works-400-billion-interactions-per-day-ain-t-easy-1306420
https://medium.com/refraction-tech-everything/how-netflix-works-the-hugely-simplified-complex-stuff-that-happens-every-time-you-hit-play-3a40c9be254b
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