With all the time spent trying to shore up the privacy and security of your own Facebook profile, there's an important setting you need to remember to update to help ensure that your friends don't expose information about you.

When your Facebook friends use , those appls can request information about other friends--i.e. you--even if you don' t use the app. This information can include your bio, photos, political views and places you check-in to.

To prevent this, visit Account > Privacy Settings > Apps and Websites. Click "Edit Settings" next to "Info accessible through your friends" and uncheck any necessary boxes.

Note that while you can prevent your friends' applications from accessing most of your information, your name, profile picture, gender, networks and user ID (along with any other information you've set to "Everyone") can be accessed by Facebook apps. The only way to ensure all your information is private is by turning off "platform applications and websites."