title: og:image and facebook linter are showing 2 different images
body: <p>I changed the og:image being used for this post a week ago and the old one still shows up when you check the url in linter. The url is the same in the meta tag but the pic IS different. Could it be a FB Cache issue? For a week? If so, Is there a way to clear fb cache?</p>
  
  <p><a href="http://blogs.edweek.org/edweek/Bridging-Differences/2013/02/dear_alfie_i_follow_your.html" rel="nofollow">http://blogs.edweek.org/edweek/Bridging-Differences/2013/02/dear_alfie_i_follow_your.html</a>
  Image that should appear
  </p>
  
  <p>But you'll see linter shows the old image still (which was too small). I was under the impression that linter will refresh the cache. I did read to put a totally different image url in there and then switch it back but it didn't work. When I changed the url, that did get updated but then when I put the url back to the other file name. The old image STILL displays even though the image in that url is different</p>