When Judson Laipply posted his six-minute “Evolution of Dance” video to YouTube in April of 2006, he didn’t advertise it at all. One month later, someone noticed his frenzied moves and e-mailed it to a friend. That friend e-mailed to other friends and more than 100 million views later, the rest is history. “It was all just pure luck” Mr. Laipply says.

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