Facebook is a complex, ever-changing digital world. No matter how much time you spend there, it seems there’s always more to know about it. For example, did you know that Facebook filters out most of your posts before your friends can see them? Or that Facebook users are, in general, hiding more personal information than they did even a year or two ago? These two Huffington Post articles have details.
http://www.huffingtonpost.com/2012/02/29/facebook-posts_n_1311330.html
http://www.huffingtonpost.com/2012/02/24/facebook-users-privacy-social-media_n_1299211.html?utm_campaign=022412&utm_medium=email&utm_source=Alert-technology&utm_content=FullStory