Have you ever been looking over the feeds on your Facebook home page, clicked on the thumbnail photo of a friend and suddenly realized that you have access to someone's Facebook that you've never met? It happens--what I didn't realize when it happened to me is that although the photo I was clicking on was of my friend, it had been posted by a friend of theirs that I didn't even know. By clicking on it I had access to all of the photos and all of the comments on photos in that album. Hmmm...
So I happened to be checking out the news on msnbc.com today and here's an article on "10 Privacy Settings Every Facebook User Should Know." Good information on using features that I didn't even know existed (no great revelation--I'm not exactly an internet pro).