Googled: "Porn cookies"
"When [Matt Cutts] joined the company in 1999, among his first tasks was to figure out how to block pornography searches, which accounted for one of every four queries. His solution was to assign a lesser weight in the Google algorithm to the words commonly used in porn searches... First he had to figure out the pertinent words. He spent hours poring over porn documents. Then his wife came up with the idea of baking cookies and awarding one "porn cookie" to each engineer who discovered a salacious keyword. Porn search traffic plummeted."
-- "Googled" by Ken Auletta, p56
