This isn't new at all - MajorBBS/Worldgroup had a module called Hoteleconference that did this, which if I remember correctly, you could do "world building" to

This isn't new at all - MajorBBS/Worldgroup had a module called Hoteleconference that did this, which if I remember correctly, you could do "world building" to design rooms, descriptions, actions, etc. much like a mud but with a more social context.