text: require(['gitbook', 'jquery'], function(gitbook, $) {
      var SITES = {
          'facebook': {
              'label': 'Facebook',
              'icon': 'fa fa-facebook',
              'onClick': function(e) {
                  e.preventDefault();
                  window.open('http://www.facebook.com/sharer/sharer.php?s=100&p[url]='+encodeURIComponent(location.href));
              }
          },
          'twitter': {
              'label': 'Twitter',
              'icon': 'fa fa-twitter',
              'onClick': function(e) {
                  e.preventDefault();
                  window.open('http://twitter.com/home?status='+encodeURIComponent(document.title+' '+location.href));
              }
          },
          'google': {
              'label': 'Google+',
              'icon': 'fa fa-google-plus',
              'onClick': function(e) {
                  e.preventDefault();
                  window.open('https://plus.google.com/share?url='+encodeURIComponent(location.href));
              }
          },
          'weibo': {
              'label': 'Weibo',
              'icon': 'fa fa-weibo',
              'onClick': function(e) {
                  e.preventDefault();
                  window.open('http://service.weibo.com/share/share.php?content=utf-8&url='+encodeURIComponent(location.href)+'&title='+encodeURIComponent(document.title));
              }
          },
          'instapaper': {
              'label': 'Instapaper',
              'icon': 'fa fa-instapaper',
              'onClick': function(e) {
                  e.preventDefault();
                  window.open('http://www.instapaper.com/text?u='+encodeURIComponent(location.href));
              }
          },
          'vk': {
              'label': 'VK',
              'icon': 'fa fa-vk',
              'onClick': function(e) {
                  e.preventDefault();
                  window.open('http://vkontakte.ru/share.php?url='+encodeURIComponent(location.href));
              }
          }
      };
  
  
  
      gitbook.events.bind('start', function(e, config) {
          var opts = config.sharing;
  
          // Create dropdown menu
          var menu = $.map(opts.all, function(id) {
              var site = SITES[id];
  
              return {
                  text: site.label,
                  onClick: site.onClick
              };
          });
  
          // Create main button with dropdown
          if (menu.length > 0) {
              gitbook.toolbar.createButton({
                  icon: 'fa fa-share-alt',
                  label: 'Share',
                  position: 'right',
                  dropdown: [menu]
              });
          }
  
          // Direct actions to share
          $.each(SITES, function(sideId, site) {
              if (!opts[sideId]) return;
  
              gitbook.toolbar.createButton({
                  icon: site.icon,
                  label: site.text,
                  position: 'right',
                  onClick: site.onClick
              });
          });
      });
  });
  