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San Jose Mercury News has done an unscientific review of several popular dating site personality tests:

We let four married couples try the tests at eHarmony, Yahoo Personals, Tickle and True. Each partner took the online personality tests designed to probe their psyches (fibbing a little to indicate they were single) and checked out whether the system matched them with their real mates. The results suggest that “science” isn’t always the last word when it comes to true romance.