Insiders have revealed the fascinating secrets to 's success - including just how closely subscribers' viewing habits are tracked. The California-based streamer can track every single show and movie ever watched by every subscriber. They know if you've finished watching it - and even whether you watched it on a TV, computer, or phone. Servers also track the way people scroll around the service before deciding what to watch, and whether your choice came as a result of looking for one thing, then stumbling across another.
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