I guess this way you can also use it for manga or any other medium that sometimes use both page to display something.

Just a random thought, if there is a need for privacy wouldn’t it be possible to create public / private encryption key for users so messages can be encrypted and exchanged.

This way what would be public is that there’s an exchange but nobody would be able to know what was said. It would make it at least message content private.

To make it a step further could exchange between servers also use it to encrypt which users exchange private message. I am thinking it could make it fully private then. Only sender and receiver servers could know which users were private messaging.