If you are interested in chatting to one another, click on the gadgets button and add the universal chat application to your page. Click the link it provides and a chat window should open up within the group. I haven't tested this much yet, so I don't know how good it is, but I think it works all right.
As far as when to chat... I don't have any specifics. Anyone that wants to participate, please throw in your two cents. Also, I'm working myspace pretty hard for people to join this group, but that doesn't mean you shouldn't invite people. Anyone you think would make a good addition, feel free to send them an invite or a badge.