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Facebook Best Practices:

Applications and Websites settings

Facebook provides users with powerful controls to protect themselves online, but it's up to individuals to check and ensure that appropriate settings are in place. Facebook makes a point of saying on their guide to privacy that they "do not give—and have never given—anyone's data or personally identifiable information to advertisers."

Facebook does, however, allow third-party applications to access information that you make public. And any information you share through with friends can be shared to applications as well—should you choose to allow it. As noted below, we recommend that you do not.

Privacy Settings: Applications and Websites

Option Sophos recommends Why?
What your friends can share about you through applications and websites Uncheck everything Checking any option on this list allows an application that a friend uses—one that you might not even use—to access that information about you. In general, the less you have under your control, the more vulnerable your information.