The current #1 on the New York Times most popular articles list is an item that appeared in the Technology section on the weekend: The 3 Facebook Settings Every User Should Check Now.
In terms of complexity, the Facebook privacy settings lie somewhere between the calculations behind a space shuttle launch and figuring out what the Toronto Maple Leafs need to do to win a Stanley Cup. These things are simply beyond most of us mere mortals. I think it is safe to say that most Facebook users do not appreciate all the nuances of Facebook privacy settings, especially when it comes to third-party apps.
This is the clearest explanation of the basic Facebook privacy settings I have ever come across. If you are a Facebook user you should read this article and tweak your privacy settings.
Cross posted on Avoid a Claim