Guess what... it's not.
It may be convenient to catch up with all of your family and friend's activities, but Facebook doesn't really care about your privacy. In fact, they're getting better at concealing their agenda to delve deeper into your personal data.
Before you shrug your shoulders and dismiss how they track everything you do on the web, you should take a few minutes to educate yourself (you'll learn how to stop it as well).
Essentially, by using these apps, just reading an article, listening to a song, or watching a video, you're sending information to Facebook which can then be automatically shared with your friends or added to your profile, and Facebook doesn't ask for your permission to do it. -Alan Henry