function FacebookService($http, config) {
      this.getUserPicture = function(userId, token) {
      return $http({
        method: 'GET',
        url: 'https://graph.facebook.com/' + userId + '/picture?type=large&redirect=false'
      })
    }
  }

function HomeController($scope, $cordovaNativeStorage, FacebookService, $ionicLoading) {
  if (window.cordova) {
    // Get Facebook access token
    $cordovaNativeStorage.getItem("facebookAccessToken").then(function(value) {
      $scope.facebookAccessToken = value

      // Get Facebook user picture (currently stored as a URL, would want to store it as a base 64 string which can be displayed as an image
      FacebookService.getUserPicture($scope.facebookUserData.id).then(function(dataResponse) {
        $scope.facebookUserPicture = dataResponse.data;

        // Save Facebook user picture
        $cordovaNativeStorage.setItem("facebookUserPicture", $scope.facebookUserPicture).then(function() {}, function(error) {
          console.error("Unable to cache user data: " + result);
          $ionicLoading.show({
            template: 'Unable to cache user data',
            duration: 1500
          })
        });
      }, function(error) {
        console.log(error.data.error.message)
      })
    }, function(error) {
      console.log(error.data.error.message)
    })
  }
};

<img class="icon icon-home img-circle" ng-src="{{ facebookUserPicture.data.url }}">