title: Google Plus share dialog showing wrong image, using OpenGraph meta tags
body: <p>I am using OpenGraph tags so when I share my page on Facebook or Google+, those services will know what image should be displayed in the share dialog. </p>
  
  <pre><code>&lt;meta property="og:title" content="Best Site Ever" /&gt;
  &lt;meta property="og:description" content="This website rules" /&gt;
  &lt;meta property="og:image" content="http://example.com/image.png" /&gt;
  </code></pre>
  
  <p>Both services were displaying the correct image, but I changed the image (and filename) in og:image.  Only Facebook is showing the new image, after running it through their URL debugger.  Google+ is showing the old image, I also ran my URL through their debugger, but the image will not update.  Anyone know why?</p>