Craigslist is a classified advertisements website that started as an email list in 1995 for events in San Francisco. It grew rapidly through word of mouth and expanded to include job postings and apartments. The site was incorporated in 1999 and expanded to 31 new cities between 2001-2003. Craigslist's main revenue comes from fees for job, apartment and other classified postings, with prices varying by location and category. Its simplicity, community of 60 million users, and focus on local markets by location have contributed to its success against competitors.