That's referring to the Facebook integration in iOS. There were similar integrations for Flickr, Vimeo and Twitter as well. These have been removed as of iOS 11

That's referring to the Facebook integration in iOS. There were similar integrations for Flickr, Vimeo and Twitter as well. These have been removed as of iOS 11. It would let you sync your contacts and add their Facebook profile pic to them, as well as post to Facebook using a system UI. Apparently this API gave Apple more permission than was needed for these features, but that Apple was unaware of it. https://www.macrumors.com/2017/06/05/facebook-twitter-integration-eliminated-ios-11/ https://www.macrumors.com/2017/06/05/facebook-twitter-integr...