I recently noticed that only a couple of my contacts' birthdays show up on my calendar on OS X. For instance, I have four friends with birthdays today, but only one is on my calendar. I tried deleting and re-adding my Facebook account but notice no difference.

I'm getting the exact same behavior on my iPhone.

Maybe this isn't a Mac issue. Did Facebook change the way its sync works?

  • Are you getting any Facebook data other than the birthday for those contacts (avatar, etc.)? If not, it's possible the OS X Facebook integration is failing to match those contacts with their Facebook accounts (they could be using different email addresses on Facebook than you have in Contacts, for example). – Dan J Jul 17 '13 at 23:57
  • @DanJ - When I click on the Facebook section of the Contacts App, I only see the friends whose birthdays are showing up. It looks like Facebook isn't grabbing any of their information. Is this just a privacy setting they've enabled? – Tyler DeWitt Jul 18 '13 at 14:21

Facebook has an option for friends to Opt OUT of their birthdays being displayed to other people. So if I had you on FaceBook and I turned the option off to display to you what my Birthday is, the it won't sync to your Calendar.

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  • 1
    If I log into Facebook I see those 4 birthdays (that's the only way I know it's their birthday). Does this option only prevent outside services (ie OS X Calendar) from showing the birthday? – Tyler DeWitt Jul 17 '13 at 15:04

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