Might be just me (and my old fashioned ideas ), but I find the concept of chatting to people that I don't know, or when I don't know exactly who's going to be in the room kinda off-putting. I'd probably prefer something more akin to the old AOL Messenger, where you specifically contact someone/they contact you & then you chat. (This might be possible under the current system tho - I've never ventured that far in.)