I noticed in 12.10 that empathy requires you to 'authorize' Ubuntu to access your facebook account, whereas 12.04 would just use the xmpp protocol to add a facebook account without authorization.
Anyway, I downloaded pidgin instead.
To get say 'pidgin', to show up in the message area, you need to:
Alternatively you could just add ['pidgin','empathy'] and whatever programs you want to show up in the systray.
1. run dconf-editor
2. open com -> canonical -> unity -> panel
3. set systray-whitelist to “['all']“