title: Sharing on Twitter does not show thumbnail of the image
body: <p>I want the users to share a page of my website on Twitter. I've a button as follow:-</p>
  
  <pre><code>&lt;a href="http://twitter.com/intent/tweet?text={{title}}&amp;url=http://{{request.get_host}}/ad/{{slug}},{{id}}" target="_blank"&gt;&lt;/a&gt;
  </code></pre>
  
  <p>My meta tags are as follow:-</p>
  
  <pre><code>&lt;meta property="og:type" content="website" /&gt;
  &lt;meta property="og:title" content="{{title}}" /&gt;
  &lt;meta property="og:description" content="{{description}}" /&gt;
  &lt;meta property="og:image" itemprop="image primaryImageOfPage" content="http://{{request.get_host}}{{images.0}}" /&gt;
  &lt;meta property="og:url" content="http://{{request.get_host}}/ad/{{slug}},{{id}}"/&gt;
  &lt;meta name="twitter:card" content="summary"&gt;
  &lt;meta name="twitter:domain" content="{{request.get_host}}"/&gt;
  &lt;meta name="twitter:title" property="og:title" itemprop="title name" content="{{title}}" /&gt;
  &lt;meta name="twitter:description" property="og:description" itemprop="description" content="{{description}}" /&gt;
  </code></pre>
  
  <p><a href="https://twitter.com/prafulbagai/status/801785504198819840" rel="noreferrer">This</a> is what I get after I click the share link. 
  My expected(ideal) result should be like <a href="https://twitter.com/prafulbagai/status/801784890538606592" rel="noreferrer">this</a>. What am I missing? </p>
  
  <p><a href="http://goontrade.com/ad/selling-panda,1/" rel="noreferrer">This</a> is the page that I want to share.</p>