How do I test multiple image sharing options?
You must test on with a real device (iPhone/iPad), since the iOS Simulator doesn’t support Document Interaction Controller. Also, you should first login into Facebook or Twitter into device Settings-> Facebook or Twitter. You have to do that once forever, your device will store ID and passwords for your social accounts. Lastly, you must have Instagram installed on your device if you want to share your image on it, as well as other apps installed that can handle images (such as iPhoto, Photoshop, Sketchbook, Adobe Reader, etc.).