i looked at the video, sawed the fb-messenger app, but i heard nothing about the integrated chat ...
hubs never worked out because every 3rd party wants their own kingdom.
you ALWAYS have to shoot for the LCD of services with hubs, because in order to display things uniformly you can't take advantage of gee whiz features only available in one service. This is why FB is coming with their own messenger app as integrated messaging can't support stickers and crap.