title: Facebook Open Graph not clearing cache
body: <p>I'm having troubles with my meta tags with Open Graph. It seems as though Facebook is caching old values of my meta tags. Old values for Attributes <code>og:title</code> and <code>og:url</code> are still used, even though I have changed them already.</p>
  
  <p>I ran Lint on <a href="http://pinq.dk/tilbud/landsdaekkende/lissy/" rel="noreferrer">a page in my site</a>, and this appeared:</p>
  
  <p><img src="https://i.stack.imgur.com/O8KBx.png" alt="Facebook Open Graph lint screenshot"></p>
  
  <p>Notice that there are two values for <code>og:title</code> and <code>og:url</code>, and the last one prevailed. However, <strong>The last two entries are the OLD entries</strong> that I used for this site. I am now currently using these meta tags (you can verify if you view the source of the HTML):</p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;meta property="og:title" content="Smart og rummelig pusletaske fra Petit Amour med god plads til alt &amp;#8211; værdi 1.099 kr &amp;#8211; køb nu kun 599 kr   "/&gt;
  &lt;meta property="og:description" content="Pinq.dk - Det gode liv for det halve"/&gt;
  &lt;meta property="og:type" content="product"/&gt;
  &lt;meta property="og:url" content="http://pinq.dk/tilbud/landsdaekkende/lissy/"/&gt;
  &lt;meta property="og:image" content="http://pinq.dk/wp-content/themes/pinq/images/logo-top.png"/&gt;
  &lt;meta property="og:site_name" content="Pinq" /&gt;
  &lt;meta property="fb:app_id" content="161840830532004" /&gt;
  </code></pre>
  
  <p>Why is Facebook caching <code>og:title</code> and <code>og:url</code>? Is anyone experiencing the same issue?</p>