- Facebook friends' birthdays show up in Notification Center, occupying space and making it look confusing.
- If you press the notification by accident, it re-enables the Facebook birthdays calendar, after you've hidden it.
- Hiding Facebook birthdays calendar in Calendar app - NO
- In Settings > Facebook, disable Contacts and Calendar. Re-enable Contacts. Seems to work, but WARNING: WILL RESET FACEBOOK CONTACTS ON YOUR PHONE, BREAKING ALL LINKS BETWEEN CONTACTS. Also, in this case, you can't use your FB calendar. Update: NO, birthdays will reappear a few days later.