IPhone calendar syncing to husband's Facebook?

Have no idea why but, for some reason, my iPhone calendar syncs to my husband's Facebook so I keep getting notifications when it's one of my husband's Facebook friend's birthday. I have the Facebook ap but this is signed into my account and I'm pretty sure neither my husband nor me have ever accessed his Facebook from my phone. Any idea why this has happened and his i can stop it from happening again?

Go to your iphones settings. Scroll down to the Twitter and Facebook area. Click Facebook. Your husbands facebook might be logged in there.

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