Yeah for me, the facebook app doesn't sync to calendar. What I did was login to facebook on my computer, click events, then click birthdays, and at the bottom of the screen there should be a link to export birthdays. After clicking that, it'll pop up with a url that you can copy and paste into your gmail calendar (on pc). I'm not sure what exactly you click within your gmail calendar on the computer to allow you to paste that link and get it to sync properly, I know I had to try a couple of times before I got it to work. Once you do get it to work, those facebook birthdays will now be in your google (gmail) calendar, which already is syncing with your phone. If it isn't, (on your phone) go into accounts and settings, then touch your gmail account and there should be a checkbox for the calendar. Just make sure it's checked, and you should be good to go.