with iOS9 application openURL:sourceApplication:annotation is deprecated
func application(application: UIApplication, openURL url: NSURL, sourceApplication:
The following used on facebook site till (Jan 1, 2017)
func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
let handled = FBSDKApplicationDelegate.sharedInstance().application(app,
open: url,
sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String?,
annotation: options[UIApplicationOpenURLOptionsKey.annotation])
return handled
}