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OkCupid

As far a free sites go, OkCupid is one of the best. It has a healthy community of decent people, lots of social features, few ads, and a great interface. It's suitable for all age-groups. OkCupid has great developer support, too. The site is rich with features like an in-depth profile, quizzes, icebreakers, and a weekly email of your best matches sent directly to your inbox. Matches are made based on answering questions about what you prefer in you ideal mate. There are hundreds of questions, all optional, that increase your matchmaking success. Even among paid sites, OkCupid top-notch, so give it a shot. Members: 3.5 million.