Sarah at the ReadWriteWeb has written a nice article alerting you to What Facebook Quizzes Know About You.
Let's be clear: we're not talking about your quizzes, probably you never indulge in any of those (like me). Even then, when your friends take quizzes, your privacy is being invaded. Huh? How can you stop this? Here's how.
Go to Settings->Privacy->Applications. Switch from the Overview to the Settings tab.
Uncheck all the boxes there. If you have never linked any external application with Facebook, and never used any application inside Facebook, you can also opt to choose the second option – Do not share any information about me through the Facebook API.
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