There are six important attributes -- including emotion and practical value -- that can help determine whether a marketing message will go viral, according to Jonah Berger, author of "Contagious: Why Things Catch On." Companies of all sizes can tap into the power of word-of-mouth, which is 10 times more effective than advertising, he notes. "You don't need a huge advertising budget, you just have to get people talking," he said.

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