I was struggling to get my Facebook like button to callback to allow for tracking when using an asynchronous method.
I came across this article that had the winning answer for me; posted by Dennis M.
http://stackoverflow.com/questions/6817894/fb-event-subscribe-not-firing-for-certain-events
What it turns out was my issue was that I was missing some parameters to the FB.Event.subscribe
Regardless, there doesn’t seem to be much information on the net about doing this asynchronous method; so thought I’d share to hopefully direct people in the right direction.