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Before answering a quiz, figure out who created it. Is it a brand you trust? Just because something seems fun and innocent, doesn’t mean it is.

As useful and fun as these quizzes might be to the respondents who answer them, there's another group that's extremely interested in the answers given by quiz-hungry Web surfers: Marketers.

Matt Ramme started making quizzes online, other trivia enthusiasts on the Web caught on, and Ramme is now the founder of a Seattle-based trivia website with more than 500 million games played.