title: Can I use the facebook feed dialog to post raw image data?
body: <p>I am generating a png using the html5 canvas element, so I have raw data in the form of a data:image url... Is it possible to use this data to post a picture to a facebook wall? </p>
  
  <p>I'm assuming the answer is 'no', as I receive the following error: </p>
  
  <blockquote>
    <p>API Error Description: The specified URL is not owned by the
    application</p>
  </blockquote>
  
  <p>It does upload the image, apparently, as I'm on a slow coffee-shop connection and can watch the upload percent slowly complete. </p>
  
  <p>I'm using the <a href="https://developers.facebook.com/docs/reference/dialogs/feed/" rel="nofollow">feed dialog</a> because I'd prefer not to have a separate app that required auth... </p>