I've tried to set up WordPress chat on two sites now and Twitter authentication works just fine, but whenever I try to work with Facebook it becomes unusable.
Once I authorize the app, the page goes into an endless refresh loop. Then, when I try to enter the page in another tab, it also goes into an endless refresh loop.
You can try it out on a 2011 installation with no plugins here: http://hermpheus.andrewsfreeman.com
Any help is appreciated.