Worse yet, if your friends like something or run an app, they can get to your personal information because your friend has endorsed something.

This means either cutting your friends out of your private data, selecting your friends based on their computer savvy, or being as vulnerable as the most insecure of them.

I say again: Facebook is the devil. It's a brilliant platform that should continue to grow for years. It uses your own friends to make you do things you would not normally do (like join). As a platform it has no other goal than total domination of the net.