Good enough

Sadly, but this app is the only _working_ solution for Facebook messaging on Mac, outside of Facebook itself. I guess Facebook just dont want anybody to use any chat clients and keep things hard to implement. So, this app just loads Facebook web chat to its own window. Thats why it works :) There are major bugs, though. The layout is broken, since Facebook introduced new sidebar with icons. Notifcations are not vanished when you click on them in Notification Center. But still, it does job better than any other apps Ive tried so far.

vrybas about MessagePro for Facebook