title: facebook feed dialog share dataURL
body: <p>I would like for the user to share client side image on facebook with the feed dialog or other approach</p>
  
  <pre><code>FB.ui({ method: 'feed',
  caption: 'Mega Tangram Picture',
  message: 'I made this tangram picture on MegaTangram',
  picture: canvas.toDataURL("image/png;base64;")
  }, function(response){console.log(response);}); 
  </code></pre>
  
  <p>Its not working with the <code>dataURL</code> standard, is there another way to do this (graph api?), it must be possible to share dynamically created images that are not held on the server?</p>
  
  <p>The error I got was:</p>
  
  <pre><code>An error occurred. Please try again later.
  
  API Error Code: 100
  API Error Description: Invalid parameter
  Error Message: picture URL is not properly formatted
  
  checkupdatefeed result parameter= undefined script.js:1183
  checkupdatefeed result parameter= 1390679958266:9.4.0 
  </code></pre>
  
  <p>When trying with <code>image/jpeg;base64</code>, I get the following error:</p>
  
  <pre><code>Could not find callback 1
  </code></pre>