Privacy Settings: As a rule I’ll put business tips on here, but I also want to make sure that if you’re using facebook at all you have your privacy settings where you want them to be. The default/recommended settings are *not* about protecting *your* privacy. To set your privacy settings click on Account, and then Privacy Settings.  To set your privacy settings to the highest level, click on Friends Only and apply to all.

Or, click on Customize Settings, and then go through and manually determine the level of privacy you want for each element of your facebook profile.