AGN_FACEBOOK = {};
AGN_FACEBOOK.SDK = {};

AGN_FACEBOOK.SDK.load_sdk = function (appId, afterInitCallback) {

  window.fbAsyncInit = function () {
    FB.init({
      appId: appId,
      version: 'v11.0'
    });

    afterInitCallback();
  };

  (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 = "https://connect.facebook.net/en_US/sdk.js";
    fjs.parentNode.insertBefore(js, fjs);
  }(document, 'script', 'facebook-jssdk'));

};
