I partially agree with some of your points, but what if you actually want to communicate with both other instances, and be able to comment about other people's

I partially agree with some of your points, but what if you actually want to communicate with both other instances, and be able to comment about other people's comments about the movie or whatever else it is that you are discussing? I specifically do want people from both opposite sides to be able to send messages, even if they are hidden by default.