Kashmir Hill is a journalist writing on how she uses Facebook for reporting. If you use Facebook, you’d be smart to read this. Even if you don’t think journalists are interested in what you are up to, others may be. They may use the same techniques to find out more about you; even things you think are private, or protected by certain privacy settings.
Take heed.
Smart People I Know 
Take heed indeed. I have the maximum privacy settings, but I didn’t realize that my networks can be viewed. I think I will be unjoining all my networks from Facebook now.