I just installed Ubuntu 12.04 and it made me switch from Windows (irrelevant). I connected Empathy to my Facebook account and it worked really well for a couple of days, and all of the sudden it tells me "Authentication failed for account Facebook (xxxxxxxxx)". Is there a solution to fixing this problem?
Sometimes Facebook has issues with messengers that isn't its own. I recommend giving it some time - in my experience it's usually back up and working within 24 hours.