The Attention Economy is a concept unifying the different approaches to enter the user's mind, from search engines to spreading through the social graph of social networks to recommendations.
10. What is Information? Relativity (left) and Sky and Water I (right) by M.C. Escher articles, books, cartoons, databases, encyclopedias, files, gestures, holograms, images, journals, knowledge bases, laws, maps, numbers, ontologies, paintings, quizzes, rules, signs, texts, users, variables, web sites strange loops of circular definitions: data is information is knowledge is information is data
90. Anatomy of the Long Tail Chris Anderson retracted his estimate that 57% of Amazon's book sales are in the Long Tail. Full Description at - http://longtail.typepad.com/the_long_tail/2005/08/a_methodology_f.html