Psychoanalytic investigation has shown that in mental patients excessive affection often turns to violent hostility.
One of the things we did at PayPal was collaborative filtering and machine learning: looking at patterns of human behavior. We used it there to predict when people would try to cheat the system to get money. But you can predict pretty much any behavior with a certain amount of accuracy.
Things got so bad that when I went shopping for a house, some people would refuse to open the door if they saw it was me standing there. And drunks would always want to challenge me.
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