Whenever you try and present a TWTweetComposeViewController and a user has no Twitter account added to their device they are prompted to go to the Settings app and add one. Once they are done they have to manually navigate back to the application.
Is there any way for my application to know that they have successfully added an account?
Actually, there is a way to be notified of new accounts while your application is running. ACAccountStore provides a notification ACAccountStoreDidChangeNotification which you can observe for changes using Key-Value Observing.