When I am ready I have on my drawing board a multi-player social world idea. This will be a private community so we are not talking tons of players. However, one question is there information anywhere regarding setting up a chat system for users? Just simple /say perhaps private messaging? Thanks!
If you are talking about ingame chat (vs. web based), then try to take a look at the Unity lobby example that comes with the SmartFoxServer API download: http://www.smartfoxserver.com/labs/API/
Alternatively check out the network resource download on the unity3d page. includes chatting functionality as well