"The Library of Babel, described by Jorge Luis Borges, stores an enormous amount of information. The Library exists {\it ab aeterno}. Wikipedia, a free online encyclopaedia, becomes a modern analogue of such a Library. Information retrieval and ranking of Wikipedia articles become the challenge of modern society. We analyze the properties of two-dimensional ranking of all Wikipedia English articles and show that it gives their reliable classification with rich and nontrivial features. Detailed studies are done for countries, universities, personalities, physicists, chess players, Dow-Jones companies and other categories."

"... rise of new opportunities for specialized information and data mining services that go deeper than what's available in search engines..."

Redisintermediating the collective since 2008 or so.

Consider using to cluster (or impose a metric upon) del.icio.us posts, blog posts, or other semantic tagged items. Taking into account time-density of topics and usage.

Amusing side-by-side juxtaposition