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You'll need to cut down your friends to just the core people that are important to you.
See full story: Lockdown or Death for your FaceBook Profile: An Advanced User Guide to Social Networking Privacy
This is what Facebook's new Privacy settings area looks like. The "Recommended" settings are still too permissive.
This is what your Privacy Settings screen should look like when properly optimized. Take note of the "Customize Settings" link, you'll need to make changes in there so your settings come out looking like this.