If you log into Facebook and go to the upper-right and choose the ACCOUNT pull down menu, and choose PRIVACY SETTINGS.
You will need to go into each of these and AGAIN flip the NEW settings from “EVERYONE” to “FRIENDS ONLY” or if you want to take a chance, you could select “friends of friends”, but we do not advise it.
It is PARTICULARLY IMPORTANT to check the settings within Privacy Settings called “APPLICATIONS AND WEBSITES”. Consider turning OFF all sharing with anyone else outside of Friends.
To underscore this problem, a recent article was published on the informative site darkreading.com, explaining how Palo Alto Networks is planning to help corporations from allowing employees to carelessly allow Facebook applications from offering up corporate information, silently.
Here is a terrific quote from this article:
The new default Facebook privacy settings are designed to share private and corporate information with advertisers and other third parties. In enterprises, this policy has major implications, as there is no central way for IT security teams to protect their users from the unknown and in almost all cases unwanted privacy impact, which involves the sharing of behavioral and website information with Facebook and its advertising customers.