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Since 2003, several free dating sites, operating on ad based-revenue rather than monthly subscriptions, have appeared and become increasingly popular.Several newer sites such as Ok are beginning to offer more full featured dating services for free, and are starting to compete with staples in the free dating site world such as
Such sites earn revenue from a mix of advertising and sale of additional options.
Online daters may have more liberal social attitudes compared to the general population in the United States.
The highest scoring dating service was Facebook, which uses the personal homepage genre, the message board genre, the weblog and directory genre, as well as utilizing the Circle of Friends.
The second highest scoring, Second Life utilizes virtual worlds, message boards, chat groups and profile pages to allow people to contact in a three-dimensional environment.
Research about social networking reveals that the online dating services driven by subscriptions offer the least amount of social networking opportunities.