So, you think you’ve honed the Netflix recommendation engine by rating 1000 movies? That’s nothing, according to the company’s internal statistics. Several 100 Netflix members have rated more than 50k filmed entertainment programs. To watch all those at a pace of 1 movie or TV show per day, it would take 136 years. But those users are just the extreme end of a broader behavioral pattern. 0.07% of Netflix users have rated 20k items. 1% have rated 5k movies. Only 60% of Netflix users rate any movies at all, and the typical person only gives out 200 starred grades.

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