Smartest thing I've read today.

Shirky: Ontology is Overrated -- Categories, Links, and Tags: "Clay Shirky's Writings About the Internet
Economics & Culture, Media & Community

Today I want to talk about categorization, and I want to convince you that a lot of what we think we know about categorization is wrong. In particular, I want to convince you that many of the ways we're attempting to apply categorization to the electronic world are actually a bad fit, because we've adopted habits of mind that are left over from earlier strategies.