Groups
www.jackedfreaks.com
Short answer they allow you to have your own community in KF or join others that exist.
Groups allow you to be the admin, appoint moderatos, invite members.
Create your own forum categories, resource and media section, events etc.
With a group you can allow anyone to join and see, or have it closed only invited members or even PRIVATE so it doesn't even show at all except for invited members and staff.
This is a perfect way of discussing items there are no categories at JF, or for example discussing items with only those you want to.
Sure Facebook you can create one, but unlike Facebook we wont track you or your members and put your security FIRST!