If you use Google Calendar on your Android smartphone like I do on the Samsung Galaxy S3 and have been victim to Facebook making a mess of your Calendar more than once, here’s a fix. Buried in the depths of obscurity is a Facebook Birthday notification feature that is the root cause of randomly corrupting my Calendar. Before this solution I have had to uninstall/reinstall Facebook app — it had happened numerous times since I got the phone. At the same time I have Google Calendar and Facebook app installed on the iPad 2 and have never seen this happen so I got curious and began comparing setting after setting until I came across the Mobile Push setting.
A common reaction to this problem is to disable Facebook Sync — this does not work!
What finally worked — uncheck Birthday Reminder option that’s buried under several menu settings
Go to Account Settings …