Jonah Berger, an assistant professor of marketing at Wharton just wrote a book exploring the reasons why products go viral.
The book, Contagious: Why Things Catch On, covers six key features that all viral products share.
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Products should have social currency and make their owners feel special
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Products should have triggers to keep people coming back. At MeetMe, we call this reengagement
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Your customers will evanglize your products if they have an emotional impact.
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Cool looking products with high visibility.
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A truly useful product is often recommended.
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A good story to tell.
via The Secrets of What Makes a Product Go Viral | Entrepreneur.com.
Also visit the companion website Virality Explained.