facebook.js

/**
 * Referências caso necessário
 * http://copacocacola.terra.com.br/infografico/dribles/info-dribles/js/info.js
 */

var facebook = (function() {
    var share =function(data, type) {
      type = type ? type : 'feed';

      FB.ui({
        method: type,
        message: data.message,
        name: data.title,
        picture: data.image,
        description: data.content,
        link: data.url,
        actions: [{
            name: data.title,
            link: data.url
        }],
        user_message_prompt: data.title
      },

      function(response) {
        // cat your reponse
      });
    },

    getFriends = function() {
        // get all friends
        FB.api('me/friends', {fields: 'username, name, id, first_name'}, function(friends) {
            var friends_list = friends.data;
            var total = friends_list.length;
            var html = "";
            var fb_f = getPhoto;

            // substituir por template handlebars
            for(var i = 0; i < total; i++) {
                html += "<a href='#' class='select-friend' data-id='"+
                friends_list[i].id +"' data-pos='" + i + "'" +
                "data-name='" + friends_list[i].first_name +
                "' ><img src='" +
                fb_f(friends_list[i].id) +
                "' title='" + friends_list[i].name +
                "'/> <br> " + friends_list[i].first_name +" <span class='select-friend-mask'> </span> </a>";
            }

            // codigo do scrollbar
            $('.box-select-friends').html(html).mCustomScrollbar();

            setTimeout(function() {
                $('.box-select-friends').mCustomScrollbar("update");
            }, 2000);

        });
    },

    getPhoto = function(id, w, h) {
        if (w && h) {
            return 'https://graph.facebook.com/' + id + '/picture?width=' + w + '&height=' + h;
        }
        return 'https://graph.facebook.com/' + id + '/picture';
    };

    return {
        share: share,
        getFriends: getFriends,
        getPhoto: getPhoto
    };

})();

index.html

<script>
  
  $(function() {
      $('.share-button').on('click', function(e) {
        e.preventDefault();
    
        var $self = $(this),
            
            data = {
              title : $self.data('title'),
              url : 'http://garoto.com.br/pascoagaroto',
              content : $self.data('content')
              image : 'image url'
            };
      
      facebook.share(data);
    });
  });
  
</script>