Adam L. Penenberg is a contributing writer to Fast Company, a professor of journalism at New York University, and the author of Tragic Indifference: One Man's Battle With the Auto Industry Over the Dangers of SUVs.
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Many of the most successful Web 2.0 companies, including MySpace, YouTube, eBay, and rising stars like Twitter and Flickr, are prime examples of what journalist Adam L. Penenberg calls a 'viral loop'—to use the product means having to share it with ... SEE MORE