Facebook Messenger Chat Extension

gistfile1.txt

<script>
      window.fbMessengerPlugins = window.fbMessengerPlugins || {
        init: function () {
          FB.init({
            appId            : 'xxxxxxxxxxx',
            autoLogAppEvents : true,
            xfbml            : true,
            version          : 'v2.10'
          });
        }, callable: []
      };
      window.fbAsyncInit = window.fbAsyncInit || function () {
        window.fbMessengerPlugins.callable.forEach(function (item) { item(); });
        window.fbMessengerPlugins.init();
      };
      setTimeout(function () {
        (function (d, s, id) {
          var js, fjs = d.getElementsByTagName(s)[0];
          if (d.getElementById(id)) { return; }
          js = d.createElement(s);
          js.id = id;
          js.src = "//connect.facebook.net/en_US/sdk/xfbml.customerchat.js";
          fjs.parentNode.insertBefore(js, fjs);
        }(document, 'script', 'facebook-jssdk'));
      }, 0);
      </script>
      
      <div
        class="fb-customerchat"
        page_id="xxxxxxxxxxxxxx"
        ref="">
      </div>