code: function load() {
    var params = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
  
    params = (0, _lodash.defaults)({}, params, {
      locale: 'en_US'
    });
    return new Promise(function (resolve, reject) {
      if (window.FB) {
        return resolve(window.FB);
      }
  
      var src = '//connect.facebook.net/' + params.locale + '/sdk.js';
      var script = document.createElement('script');
      script.id = 'facebook-jssdk';
      script.src = src;
      script.async = true;
      script.addEventListener('load', function () {
        return resolve(window.FB);
      }, false);
      script.addEventListener('error', function () {
        return reject('Error loading Facebook JS SDK from ' + src);
      }, false);
  
      var sibling = document.getElementsByTagName('script')[0];
      sibling.parentNode.insertBefore(script, sibling);
    });
  }
docs: Injects the script for the FB JS SDK into the page.
  
  @param {Object} params containing optional settings
  
  @return {Promise} for the global window.FB object