There essentially is one built into the Premium aspect of the site. I have tried to get people to use it during games, but so far no takers.
On desktop or mobile, look in the main menu under premium and there is a chat function that gives a real time chat room. The cons are that it only seems available to premium members and they have to be online at the same time. Would be cool to use for real time convos though.
Ryan
Kinnaird Guitars