Craigslist is a classified advertisements website that allows users to post listings for jobs, housing, items for sale, and services for free. It began in 1995 serving only San Francisco but has since expanded to serve over 450 cities worldwide. While simple in design, Craigslist is effective in allowing users to easily find what they are searching for. Some controversy exists around scams targeting users. Financially, Craigslist does not use advertising but has become powerful through its expansion and protecting its domain name.