Hi there!
I've created a concept to replace private messages and chat rooms.
Let's take the example of a hotel: you go to reception, get the keys to the room you've been allocated and go to bed. When your stay is over, you return your keys and a cleaner comes to clean your room.
These chat rooms work in the same way: you sign up by mentioning me, telling me how many people will be talking in the room, and once that's done, I assign you an empty chapter in the story. You can then talk in the comments with your friends, just as you would by pm.
Once you've finished talking about what you wanted to talk about in mp, I'll delete the chapter and recreate another one without reading your discussions (I promise to do this).
Don't hesitate to talk about it around you, and if you feel like talking to someone in private, book a room ;)