Sync Facebook with Google Calendar and CalenGooIf your phone doesn’t support a sync with Facebook via the Android calendar or if you have problems with it, you can also sync Facebook via Google Calendar with CalenGoo:
Sign in to Facebook, open one of your eventsand click “Export event”:
You should get an URL that starts with “webcal”:
Sign in to Google Calendar and click “Add”, “Add by URL” on the left under “Other calendars” and enter the “webcal”-URL:
To add your Facebook birthdays to Google Calendar just replace "u.php" with "b.php" in the webcal URL.
Afterward your Facebook calendar should appear as a normal shared Google Calendar. You may have to tap “Sync” in CalenGoo’s menu or “Refresh Android calendars” in the menu under “Settings”, “Visibility/Download” in CalenGoo to refresh the calendar list and make this new calendar appear.