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which were often hard to use and offered few popular items to read. But this year, in part because of the popularity of Amazon.com’s wireless Kindle device, the e-book has started to take hold.

At first glance, this evolution might seem to be simply a shift in agency, from publication by a few to collective contribution by many. But in fact, the implications of Web 2.0 go much deeper: the tacit epistemologies that underlie its activities differ dramatically from what I will call here the “Classical” perspective—the historic views of knowledge, expertise, and learning on which formal education is based.

In contrast, the Web 2.0 definition of “knowledge” is collective agreement about a description that may combine facts with other dimensions of human experience, such as opinions, values, and spiritual beliefs. As an illustration, the Wikipedia entry on “social effect of evolutionary theory” wrestles with constructing a point of view that most readers would consider reasonable, accurate, and unbiased without derogating religious precepts some might hold. In contrast to articles in the Encyclopedia Britannica, Wikipedia articles are either undisputed (tacitly considered accurate) or disputed (still resolving through collective argumentation), and Wikipedia articles cover topics that are not central to academic disciplines or to a wide audience (e.g., the cartoon dog Scooby-Doo).