Fun facts from the article: CraigsList’s 45 regional sites get a billion page views monthly and 5 million unique visitors. Classifieds account for 40-45% of a newspaper’s advertising revenues, or $15.8 billion dollars per year in the US. Craigslist’s annual revenues are guessed to be $7-$12 million/year. Craigslist does not advertise, relying on word-of-mouth.
One Billion Monthly Pageviews! Unbelieveable.