Kamilar wrote: I really didn't understand you.
No problem. I do not expect that.
The billboard could
temporary store information on plans or ideas of chars, simulating handbills.
This information could be accessed by other chars.
For example a char living in the wilderness near the Necktie Inn could load up an invitation to a certain place in the vicinity of the Inn.
A char in Galmair could read the message on the Galmair billboard and descide to visit the person who posted the invitation.
To show the state of the billboard it could have different object pictures, showing the exact number of active handbills (no parchment, 1, 2...) up to ten for example.
The basic difference to posts in the forum would be the automatic deletion after a preset time.
There are also other possibilities for this system to fill the gap between forum and chat.
For example delays could be included, depending on the distance between the billboards.
In the future this system could also be linked to an IG-letter system or shared containers.
Also NPCs could be attached to the system, for example night watchmen or heralds.
Selfspoken the billboards could also be used by GMs.
My idea is not directed towards communication between POs who already know each other and could also use teamspeak or chat OOC.