People are social creatures—they talk, they share, they pass things along. But unlike with an actual virus, a person chooses to be infected by an idea, and most people who confront any given thing don’t pass it along. Viral diseases tend to spread slowly, steadily, across many generations of infection. But information cascades are the opposite: They tend to spread in short bursts and die quickly. The gospel of virality has convinced some marketers that the only way that things become popular these days is by buzz and viral spread. But these marketers vastly overestimate the reliable power of
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