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More traditional sites may offer anything from a simple search to a highly specific advanced search.
Some more seriously minded sites request that members fill out elaborate compatibility questionnaires.
Focusing on a narrow pool of candidates, these online dating sites help match people up with someone of a similar religion, profession, or sexual orientation.
Examples within this category include Jdate for Jewish singles, Geek2Geek and Farmersonly for farmers and the people who want to meet them.
Mingle2 is a membership service of which users pay to be a part.
They tend to attract a wide variety of members with personal goals that range from a casual fling to a serious lifelong relationship.