I'm not a Windows Phone user so I am a bit out of my element in terms of typical application design for the phone, but some sort feedback when a user is performing an action would make the app feel more responsive.
For example, when posting the picture to Facebook the application could show a spinner with the words "Posting to Facebook"
Actually there's a spinner at the bottom of the window. (That's not visible in screencast because it is a little bit small.) However it does not have words, it's just an animation.
I'm not a Windows Phone user so I am a bit out of my element in terms of typical application design for the phone, but some sort feedback when a user is performing an action would make the app feel more responsive.
For example, when posting the picture to Facebook the application could show a spinner with the words "Posting to Facebook"