This reminds me of when I was in college and FB was only a few years old. You still needed an official university email address to even sign up.
People from the local student paper gathered substantial evidence cops were using friends only posts to figure out where the underage drinking parties were and bust them up.
FB started when Zuckerberg broke into the servers at Harvard to steal and publish his classmates' private information.

The list just keeps going and going..

[Edit] had to make it clear the cops were using private and friends only posts. Public posts are another matter