I readily admit I don't always read the help, I like to play around unless I am really stuck. But this was an option I found out purely by accident. There are private rooms in FriendFeed. Below is a cutout from the help file and then a screenshot to show the implementation.

A room is like a mini FriendFeed for a particular subject or group of people. Everyone in your room can share stuff with each other and leave comments that only other people in your room can see. When creating a room, you decide whether to make it public, where anyone can join, or private, where you have to invite or approve each member. You can even have a room with a view by selecting "Show this room's content in my feed" -- this lets you view everything from your rooms in your feed as well, instead of just in the rooms themselves.

As you can see, you get a new tab for rooms and the ability to create your own. This has excellent abilities but then adds to the comment fragmentation we already get from so many sites. So while I like the idea of bringing in feeds/comments that are set for a specific group, I would definitely have to turn on the above feature that puts it into my main stream to keep up.

Also lacking are the abilities to bring in RSS feeds directly to this room. You can only share with a web interface or bookmarklet and create links from there. I would want images, media files and then the commenting ability built on top of that. I also cannot 'like' the posting or comment as I can in the main interface. Apparently this is something that has promise but doesn't have wings yet.

Is anyone using rooms outside of the one I got invited to?