title: Add differents meta tag every joomla article
body: <p>I'd like to add facebook open graph  tags in my <strong>joomla</strong> website.
  I edited index.php and add manually:</p>
  
  <pre><code>&lt;head&gt;
      &lt;title&gt;The Rock (1996)&lt;/title&gt;
      &lt;meta property="og:title" content="The Rock"/&gt;
      &lt;meta property="og:type" content="movie"/&gt;
      &lt;meta property="og:url" content="http://www.imdb.com/title/tt0117500/"/&gt;
      &lt;meta property="og:image" content="http://ia.media-imdb.com/rock.jpg"/&gt;
      &lt;meta property="og:site_name" content="IMDb"/&gt;
      &lt;meta property="fb:admins" content="USER_ID"/&gt;
      &lt;meta property="og:description"
            content="A group of U.S. Marines, under command of
                     a renegade general, take over Alcatraz and
                     threaten San Francisco Bay with biological
                     weapons."/&gt;
  
    &lt;/head&gt;
  </code></pre>
  
  <p>In this way meta tags is applied to all my website pages.</p>
  
  <p><strong>How can I add different meta tags for every joomla article?</strong></p>