@sandstrom are you sure when you use the "export" link it is a "subscription" from what I've seen and tried it is NOT a subscription but exactly what it says it is. It exports what you have on your facebook events calendar so it's not dynamic and you would have to keep repeating the export to keep it up to date. I even tried to paste the link AS A SUBSCRIPTION this failed with an error. Not trying to be a jerk but I do believe this is meant to sync without you having to do the export process over and over on your own.

this application is superfluous. The same result is achieved by using the »Export All« functionality that is already built into Events (on facebook). Copy that url and paste into iCal. Subscription completed.