Riddle me this: what do you get when you combine a nifty little piece of Flash software, some backend mojo, an army of cellphone-toting teens, and one "Lazy Sunday" clip? The answer is, of course, the largest online video streaming service on the planet, YouTube.

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Ironically enough, however, it's YouTube's philosophy of small, digestible content and their willingness to avoid copyright issues that has positioned them to answer the age-old question of “What is fair use?”