I'm trying to implement twitter integration for my iOS app and my apps deployment target is 4.0 & greater, I'm using bengottlieb sample for twitter share, In my twitter app page in Callback URL: text field When I don't set callback url in app settings my app is crashed! (authenticatedWithUsername delegate method is getting called but it is dismissing the view controller)What callback url I must set?I want to return to the app after authorization?