anchor.diff:    the FB.login() function when clicked.
   -->
   
  -<fb:login-button scope="public_profile,email" onlogin="FB.login();">
  +<fb:login-button scope="public_profile,email" onlogin="login();">
   </fb:login-button>
   
   <div id="status">
  
positive.code:     });
    };
  
    (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.js";
       fjs.parentNode.insertBefore(js, fjs);
     }(document, 'script', 'facebook-jssdk'));
  
    FB.login(
      alert("logged in!"))
  </script>
  
  <!--
  
negative.code: <script>
  // This is called with the results from from FB.getLoginStatus().
    function statusChangeCallback(response) {
      console.log('statusChangeCallback');
      console.log(response);
      // The response object is returned with a status field that lets the
      // app know the current login status of the person.
      // Full docs on the response object can be found in the documentation
      // for FB.getLoginStatus().
      if (response.status === 'connected') {
        // Logged into your app and Facebook.
        testAPI();
      } else if (response.status === 'not_authorized') {
        // The person is logged into Facebook, but not your app.
        document.getElementById('status').innerHTML = 'Please log ' +
          'into this app.';
      } else {
        // The person is not logged into Facebook, so we're not sure if
        // they are logged into this app or not.
        document.getElementById('status').innerHTML = 'Please log ' +
          'into Facebook.';
      }
    }
  
    // This function is called when someone finishes with the Login
    // Button.  See the onlogin handler attached to it in the sample
    // code below.
    function checkLoginState() {
      FB.getLoginStatus(function(response) {
        statusChangeCallback(response);
      });
    }
  
    window.fbAsyncInit = function() {
      FB.init({
        appId      : '109878109412996',
  