FB Connect as a service in Angular JS

gistfile1.js

// Going mobile with Angular by Ari
// Source: https://speakerdeck.com/auser/going-mobile-with-angular?utm_source=ng-newsletter&utm_campaign=b5794c7e19-AngularJS_Newsletter_2_4_142_3_2014&utm_medium=email&utm_term=0_fa61364f13-b5794c7e19-96511737
angular.module('myApp')
  .provider('FBService', function() { 
    function createScript($document, callback, success) {
      var scriptTag = $document.createElement('script'); 
      striptTag.async = true; 
      striptTag.src = '//conect.facebook.net/en_US/all.js'; 
      scriptTag.onreadystatechange = function () {
        if(this.readyState == 'complete') { callback(); }
      }
      scriptTag.onload = callback;
      $document.getElementsByTagName('body')[0].appendChild(scriptTag);
    }
    this.$get = function($document, $timeout, $q, $window) {
      var deferred = $q.defer(); 
      createScript($document[0], function(callback){ 
        FB.init({appID: "02393902390"}); 
        $timeout(function() {
          deferred.resolve($window.FB);
        }); 
      });
      return deferred.promise;
    }
  })
;

// Using this service
angular.module('myApp')
  .factory('Facebook', function($q, FBService) {
    return { 
      getUserProfile: function(){ 
        return FBService.then(function(FB) { 
          FB.api('/me', function(user){
            if (user.error){ 
              return $q.reject(user.error); 
            } else { 
              return user; 
            }  
          });
      });
    }}; 
});