anchor.diff:  
       <section id="get-started">
         <p>Welcome to your Facebook app, running on <span>heroku</span>!</p>
  -      <a href="https://devcenter.heroku.com/articles/facebook" target="_top" class="button">Learn How to Edit This App</a>
  +      <a href="https://devcenter.heroku.com/articles/facebook?utm_source=facebook&utm_medium=app&utm_campaign=fb_integration" target="_top" class="button">Learn How to Edit This App</a>
       </section>
   
   
  
positive.code:             </ul>
            </div>
          </section>
  
      <% end %>
  
  
  
negative.code:       <h1>Learn More About Heroku &amp; Facebook Apps</h1>
        <ul>
          <li>
            <a href="https://www.heroku.com/?utm_source=facebook&utm_medium=app&utm_campaign=fb_integration" target="_top" class="icon heroku">Heroku</a>
            <p>Learn more about <a href="https://www.heroku.com/?utm_source=facebook&utm_medium=app&utm_campaign=fb_integration" target="_top">Heroku</a>, or read developer docs in the Heroku <a href="https://devcenter.heroku.com/" target="_top">Dev Center</a>.</p>
          </li>
          <li>
            <a href="https://developers.facebook.com/docs/guides/web/" target="_top" class="icon websites">Websites</a>
  