title: Facebook iPhone SDK: show a progress bar while uploading an image
body: <p>I want to show a progress bar while my iPhone app is uploading an image to Facebook. Is it possible?</p>
  
  <p>Can I do it with every FBRequest that I make? I also use FBRequest to check extended permission and sometimes takes a lot of time.</p>
  
  <p>Thank you.</p>