Haha, you're right! I guess that means your suggestions were very good 🙂
Edit: Still thinking of changing the "envelope" to fa-comment-o with a # inside of it.
I like that idea
Users can create a private discussion. Such discussions will be visible only to the creator. If the user wants to invite discussion of other people, then indicate - @nick @nick2 @nick3... (in the topic).
Discussion displayed will be in the selected category. Everything is as usual. But only for invited users.
It a similar idea.
What do you think?
It's probably doable via plugin.
This would probably be a good place to start, you'd basically just need to add the invite mechanic to this plugin: