Without Google, Yahoo, and their brethren, using the Web would be like wandering through a library where a prankster has restacked the books at random. Still, sorting through thousands or millions of pages spurted out by a search engine can be nearly as overwhelming. Imagine instead being able to call on the group judgment of other users, people who are constantly skimming the latest Web content and arranging the best stuff into neatly labeled piles.

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