title: Facebook Open Graph - still display wrong image
body: <p>My Open Graph publish action still display in the wall incorrect image. I've tried to clean cache in the browser - didn't help...</p>
  
  <p>Also I've tried to empty FB OG cache this way (in the Facebook Object Debugger):</p>
  
  <pre><code>http://my-website.com/my-app/?fbrefresh=CAN_BE_ANYTHING
  </code></pre>
  
  <p>but got this error:</p>
  
  <pre><code>Object Invalid Value:   Object at URL 'http://my-website.com/my-app/?fbrefresh=CAN_BE_ANYTHING' of type 'app_url_name:object_name' is invalid because the given value '' for property 'og:url' could not be parsed as type 'url'.
  </code></pre>
  
  <p>I'ev read that Facebook clean up the cache each 24 hours, but this is already third day...</p>
  
  <p>So, how could I empty the cache, if the attempts above don't works?</p>