Features: Includes Yahoo's instant messenger, live camera, voice chat, chat rooms and groups at ... Click and connect...

Features: First-time users take a 436-question test designed to evoke thoughtful and revealing responses, according to USA Today. Matches are made according to the "29 areas of compatibility,'' which founder Neil Clark Warren says are scientifically proven (eHarmony will not reveal how the 29 areas help make matches).

Perks: The daunting personality test is probably more likely to weed out insincere date-seekers; eHarmony also guarantees as many matches as months in your subscription or you get your money back.

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