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Social psychology is rife with experiments that illustrate social proof. Here's a hilarious one from the 1960s - The Elevator Experiment:

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And here's a link to Cialdini's...

A highly recommended book for this topic would be 'Influence' by Bob Cialdini he wrote in 1984. I don't think you could start with a better book than this, and I'm going to make sure my children have...