Your problem is that people are allowed to find people and talk about things that you think they shouldn't talk about? Even in your example, you had to go digg

Your problem is that people are allowed to find people and talk about things that you think they shouldn't talk about? Even in your example, you had to go digging pretty far for that group -- you didn't accidentally happen upon it. If you people are motivated to find bad information, they will. That's the nature of the internet. If you don't want people to be able to gather and share information, then unplug your Ethernet cables because that's what the internet is all about; FB or no FB.