Things You Need to Know about Facebook Privacy
Although Facebook guarantees our privacy, their guarantee applies only to a certain extent. Of course, you can always accept, reject, add and delete friends and you can control who and how they see your profile, but whenever you visit some page or product the administrators of that page takes notes. You don’t have to worry that your activity will someday be revealed to the public, but you must understand that Facebook is not a very private place. Everything you do there is collected and sorted.