Facebook has launched new groups with new functionality. The roll-out took a little while, as I heard about this new feature a few weeks ago but didn't get it until recently. The basic concept is to limit what you share by who you share it with. Instead of writing a program, Facebook decided to give the control to the users.
This is a new feature and I'm sure many of us will have suggestions on how to improve and best use it.
This is a great roll-out, but we all still need to be mindful of our privacy settings and what we share on the internet in general.