Workaround for users: Enable airplane mode and disable WiFi, or block facebook domains
Workaround for developers: Go to Facebook Developer page > Analytics and disable automatic Events.[0] Apparently this doesn't solve the issue for everyone.
Issue in Facebook's tracker: https://developers.facebook.com/status/issues/17391881029111...
[0] https://github.com/facebook/facebook-ios-sdk/issues/1427#iss...