Protect Your Privacy Opt Out of Facebook’s New Instant Personalization – Yes You Have to Opt Out

http://librarianbyday.net/2010/04/protect-your-privacy-opt-out-of-facebooks-new-instant-personalization-yes-you-have-to-opt-out

And you need to do one more thing. See the section “What Your friends can share about you”? Your friends can share things about you that you have already chosen not to share about yourself. Nice. You will probably want to uncheck most of the boxes on that page.