How to Customize and Perfect Your Facebook Privacy Settings
To be a master of your castle, all you have to do is click on the 'Account' tab at the top right-hand corner of your homepage, and select 'Privacy Settings' from the drop-down menu and then 'View Settings.' From here, you can choose to share all your info with the entire Facebook community, with friends of friends, or with your friends exclusively.
But, if you're still not satisfied with any of Facebook's preset options (and, if you're like most people, you probably won't be), you can always choose the 'Custom' option. This feature will allow you to micromanage your privacy settings down to the last detail, and determine exactly who sees what on your landing page. If you have an especially persistent ex who has a proclivity for posting saccharine, embarrassing nothings all over your Wall, you can block him entirely by adding him to the 'Block List' at the bottom of the menu.
Once you've found the right mix for you, double-check the settings by clicking the 'Preview Profile' tab near the top of the customization page. There, you can see exactly how your profile looks to specific friends, by typing in their names at the top of the page. Facebook may not officially "recommend" that you customize your profile with such a fine-toothed comb, but we certainly do.