title: How to clear Facebook's image cache
body: <p>I have a Facebook application that's created several wall-posts on behalf of my users. The image in the wall posts is cached by Facebook's servers. I've replaced the original image on my server and I would like to clear Facebook's image cache so all of the other wall posts update with the new image.</p>
  
  <p>What Facebook has cached:
  <a href="http://platform.ak.fbcdn.net/www/app_full_proxy.php?app=236915563048749&amp;v=1&amp;size=z&amp;cksum=aebffc27f986977797a9903c2b6e08df&amp;src=http%3A%2F%2Fvcweb2.s3.amazonaws.com%2Fassets%2Fweb%2Fimages%2Ficon_square.png" rel="noreferrer">http://platform.ak.fbcdn.net/www/app_full_proxy.php?app=236915563048749&amp;v=1&amp;size=z&amp;cksum=aebffc27f986977797a9903c2b6e08df&amp;src=http%3A%2F%2Fvcweb2.s3.amazonaws.com%2Fassets%2Fweb%2Fimages%2Ficon_square.png</a></p>
  
  <p>Original cached URL, now updated with new image.
  <a href="http://vcweb2.s3.amazonaws.com/assets/web/images/icon_square.png" rel="noreferrer">http://vcweb2.s3.amazonaws.com/assets/web/images/icon_square.png</a></p>
  
  <p>Is this possible? Thanks!</p>