Lots of possibilities, for sure. I liked the idea of a public layer as well as private or protected layers for every space. Patrons of a restaurant could chat on the public board for that location, while employees might bitch anonymously about management or warn each other of problematic customers on the private space. Or residents of an apartment building could complain about noisy neighbors or neglecting landlords without it being completely public.

My concept had a sort of anarchic bent at the time, so anonymity and fighting the man was the guiding principles in theory, but as I was only just learning JavaScript and PHP, ideals were going to be a later development and design phase than I ever achieved ;)