<!DOCTYPE html>
<html>
<head>
  <%%= render_page_title_tag %>
  <%%= render_page_description_meta_tag %>
  <%%= render_page_keywords_meta_tag %>
  <%%= render_page_image_link_tag %>
  <%%= csrf_meta_tag %>

  <%%= stylesheet_link_tag "application" %>
  
  <%%= yield :stylesheets %>

  <meta property="og:title"       content="<%%= page_title ||  SeoHelper.configuration.site_name %>"/>
  <meta property="og:description" content="<%%= page_description || SeoHelper.configuration.default_page_description %>"/>
  <meta property="og:image:url"   content="<%%= page_image ||  SeoHelper.configuration.default_page_image %>"/>

</head>

<%%= render_body_tag %>

<%%= render :partial => "common/menu" %>

  <div class="container">

      <%%= notice_message %>

      <div class="content">
        <div class="row">
          <%%= yield %>
          <%%= yield (:sidebar) %>
        </div> 
    
      </div>

      <%%= render :partial => "common/footer" %>    
  </div>



  

  <%%= render :partial => "common/bootstrap_modal" %>    
  <%%= render :partial => "common/facebook_js" %>
  <%%= render :partial => "common/google_analytics" %>
 
  <%%= javascript_include_tag "application" %>

  <%%= yield :javascripts %>


</body>
</html>

<!DOCTYPE html>
<html>
<head>
  <%%= render_page_title_tag %>
  <%%= render_page_description_meta_tag %>
  <%%= render_page_keywords_meta_tag %>
  <%%= render_page_image_link_tag %>
  <%%= csrf_meta_tag %>

  <%%= stylesheet_link_tag "application" %>
  
  <%%= yield :stylesheets %>

  <meta property="og:title"       content="<%%= page_title ||  SeoHelper.configuration.site_name %>"/>
  <meta property="og:description" content="<%%= page_description || SeoHelper.configuration.default_page_description %>"/>
  <meta property="og:image"   content="<%%= page_image ||  SeoHelper.configuration.default_page_image %>"/>

</head>

<%%= render_body_tag %>

<%%= render :partial => "common/menu" %>

  <div class="container">

      <%%= notice_message %>

      <div class="content">
        <div class="row">
          <%%= yield %>
          <%%= yield (:sidebar) %>
        </div> 
    
      </div>

      <%%= render :partial => "common/footer" %>    
  </div>



  

  <%%= render :partial => "common/bootstrap_modal" %>    
  <%%= render :partial => "common/facebook_js" %>
  <%%= render :partial => "common/google_analytics" %>
 
  <%%= javascript_include_tag "application" %>

  <%%= yield :javascripts %>


</body>
</html>

Use og:image instead of og:image:url
Use og:image instead of og:image:url

Since Facebook cannot parse og:image:url correctly, resulting open graph image as “unspecified.”