Bootstrap/docs/_includes/social-buttons.html

<div class="bs-social">
  <ul class="bs-social-buttons">
    <li>
      <iframe class="github-btn" src="http://ghbtns.com/github-btn.html?user=twitter&repo=bootstrap&type=watch&count=true" allowtransparency="true" frameborder="0" scrolling="0" width="100px" height="20px"></iframe>
    </li>
    <li>
      <iframe class="github-btn" src="http://ghbtns.com/github-btn.html?user=twitter&repo=bootstrap&type=fork&count=true" allowtransparency="true" frameborder="0" scrolling="0" width="102px" height="20px"></iframe>
    </li>
    <li class="follow-btn">
      <a href="https://twitter.com/twbootstrap" class="twitter-follow-button" data-link-color="#0069D6" data-show-count="true">Follow @twbootstrap</a>
    </li>
    <li class="tweet-btn">
      <a href="https://twitter.com/share" class="twitter-share-button" data-url="http://twitter.github.com/bootstrap/" data-count="horizontal" data-via="twbootstrap" data-related="mdo:Creator of Twitter Bootstrap">Tweet</a>
    </li>
  </ul>
</div>