This is the best tl;dr I could make, original reduced by 98%. (I'm a bot)

A graduate of Stanford University, Harris studied under BJ Fogg, a behavioural psychologist revered in tech circles for mastering the ways technological design can be used to persuade people.

Tech companies can exploit such vulnerabilities to keep people hooked; manipulating, for example, when people receive "Likes" for their posts, ensuring they arrive when an individual is likely to feel vulnerable, or in need of approval, or maybe just bored.

"The people who run Facebook and Google are good people, whose well-intentioned strategies have led to horrific unintended consequences," he says.

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