"The Web, left to its own devices, would be the exact opposite of [clusters of useful categories ]: It's like a giant city with no neighborhoods; it needs these kind of meta-filters, these second-level kind of things, whether it is Yahoo or Google or Slashdot, to rein in that chaos and turn it to something more organized." Steven Johnson, author of Emergence: The Connected Lives of Ants, Brains, Cities, and Software, interviewed at Salon.com.