Facebook Profiles Aren't so Secure

I just noticed recently that I can view private photos of people who I'm not friends with and have privacy settings on. At times you may come upon a friend and view their friends. Many people still haven't upgraded to the new Facebook format but for those that have and display their 5 photos at the top, any user can click on those photos and arrow over via the FB app to see many more photos than the five shown on the profile page. I was actually able to browse several friends of friends who I was not connected to and see many photos that they probably did not want the public to see.

Thoughts?