Facebook javascript login window
FB.login(function(response) {
  if (response.authResponse) {
    console.log('Welcome!  Fetching your information.... ');
    FB.api('/me', function(response) {
      console.log('Good to see you, ' + response.name + '.');
      FB.logout(function(response) {
        console.log('Logged out.');
      });
    });
  } else {
    console.log('User cancelled login or did not fully authorize.');
  }
}, {scope: 'email'});