Some have a broad membership base of diverse users looking for many different types of relationships.Other sites target highly specific demographics based on features like shared interests, location, religion, or relationship type.
Some sites are completely free and depend on advertising for revenue.
In 2008, a variation of the online dating model emerged in the form of introduction sites, where members have to search and contact other members, who introduce them to other members whom they deem compatible.
Introduction sites differ from the traditional online dating model, and attracted a large number of users and significant investor interest.
This model also allows users to switch between free and paying status at will, with sites accepting a variety of online currencies and payment options.
Most free dating websites depend on advertising revenue, using tools such as Google Ad Sense and affiliate marketing.