facebook share not giving response

I know there are hundreds of questions related to this and mostly with answers but none of them seems to work with me.

window.fbAsyncInit = function() {
    FB.init({
      appId      : #{FbAppId},
      xfbml      : true,
      version    : 'v2.8'
    });
  };

$(document).on('click', '#share_dialog_open',function(){
    var imageurl = $(this).attr('image_url');
    var blog_description = $(this).attr('descr');
    var blog_title = $(this).attr('blog_title');
    var blogid = $(this).attr('blogid');
    var vb_id = $(this).attr('vb_id');

    FB.ui({
      method: 'feed',
      link: "http://URL/" + vb_id,
      picture: imageurl,
      description: blog_description,
      title: blog_title
    }, function(response){
      console.log(response);
      alert(response);
      if(response && !response == undefined){
        window.location="/congrats"
      }
    });
});

In console.log i'm getting nothing and in alert(response) I keep getting either one these (undefined, [], [object Object])

Any kind of help of would be appreciated.

And I have also in my Omniauth.rb

provider :facebook, "#{FbAppId}", "#{FbAppSecret}", {:scope => 'email publish_actions email manage_pages publish_pages'}

To everyone, who got the same problem with new API and eventually somehow came here in search for answer. Here is how I solved it.

window.fbAsyncInit = function() {
    FB.init({
      appId      : #{FbAppId},
      xfbml      : true,
      version    : 'v2.5'    // don't_use_greater_version
    });
  };


FB.ui({
      method: 'feed', // don't use share you won't get anything in response
      link: "your_url_which_you_want_to_share,
      picture: path_to_your_image,
      description: your_description,
      title: your_title
    }, function(response){
      console.log(response);
      if (response == undefined || response == null) {
        return
      }
      else if (response.length == 0 || !response.error_code) {
        where_you_want_to_redirect
      }
    });