* the user then can use the chat app independantly from the presence thing - or not having it running at some point at all
* the chat app interacts with the presence server: it gets a stream of presence update from the presence server only if the user authorized it
* the chat app can notify a user that another user pinged him in the room
Resources:
* '''Demo''' (without the app permission dance yet): https://vimeo.com/79394330* '''Prototype repo''' https://github.com/mozilla-services/presence-chatroom
=== Facebook ===