Craigslist
The service was founded in 1995 by Craig Newmark for the San Francisco Bay Area. After incorporation as a private for-profit company in 1999, Craigslist expanded into nine more U.S. cities in 2000, four each in 2001 and 2002, and 14 in 2003. By September 2007, Craigslist had established itself in approximately 450 cities in 50 countries.