It doesn't work at all. They seem to ignore all bug reports, anyway, I found a similar app called Glow for Facebook which does basiclly the same.. works really well and makes use of Mountain Lions Notification Center..
It does not work. I downloaded it few days ago but it unable to connect to facebook. And from what i read on Facebook there are Lots and lots of people with the same problem. So unless it gets fixed completely useless. Also would be nice to hear from Dev either here or on facebook about this problem
As a casual FBer this is a nice app. It's simple, clean, does the basic functions I would want and alerts me to updates directly involving me with growl. And it's official so no worries about stolen accounts. Will get better with time.