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The Science Behind Crafting Contagious Content Jonah Berger, a marketing professor a the Wharton School of Business, has identified six key drivers of virality.

By Jason Ankeny Edited by Frances Dodds

Opinions expressed by Entrepreneur contributors are their own.

Norwegian comedy duo Ylvis may never learn what the fox says, but its video posing that musical question solved a far greater mystery: the secret behind viral media success.

"The Fox (What Does The Fox Say?)," released in September 2013, received some 40 million online views in its first two weeks and scored an astounding 276 million by December, becoming YouTube's top trending video of the year.

Silly, bizarre and undeniably catchy, "The Fox" went viral simply by provoking a powerful reaction across a range of demographics. And that visceral response is what separates viral breakouts from busts, according to Jonah Berger, marketing professor at the Wharton School at the University of Pennsylvania and author of Contagious: Why Things Catch On.

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