I know that the feature for user to user chat is implemented in the API, but I was wondering if they implemented the ability to access the group chat (the chat you can have
This was answered by one of the Facebook staff on January 18th in the Facebook XMPP Developer Relations group:
"[Multi user chat] is not currently on the XMPP roadmap, but definitely belongs on the wishlist."
This goes for both arbitrary friend chats and chats defined by members of a Facebook group.