The thought process that went into building these applications, Facebook being the first of them, . . . was all about: “How do we consume as much of … - Cal Newport

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The thought process that went into building these applications, Facebook being the first of them, . . . was all about: “How do we consume as much of your time and conscious attention as possible?” And that means that we need to sort of give you a little dopamine hit every once in a while, because someone liked or commented on a photo or a post or whatever.