title: Do any of these popular sites use the MVC pattern?
body: <p>I'm in the process of exploring Zend Framework, an MVC (Model View Controller) framework. I noticed that Zend's own site is using it (of course), but I was wondering if some of today's most popular sites:</p>
  
  <ul>
  <li>Amazon</li>
  <li>Facebook</li>
  <li>Twitter</li>
  <li>maybe Google?</li>
  </ul>
  
  <p>do as well. I ask because I am curious if it is robust and manageable enough for huge sites like Amazon and Facebook. Does anyone know if they do?</p>