diff --git a/app/views/layouts/_head.html.erb b/app/views/layouts/_head.html.erb
index b0220ddf..ba8ffa05 100644
--- a/app/views/layouts/_head.html.erb
+++ b/app/views/layouts/_head.html.erb
@@ -16,15 +16,17 @@
   <%= csrf_meta_tags %>
   <meta name="viewport" content="width=device-width, user-scalable=no">
   
-  <% if controller == 'maps' && @map %>
+  <% if controller.class.name == 'MapsController' && @map %>
     <meta property="og:title" content="<%= @map.title %>" />
     <meta property="og:type" content="website" />
     <meta property="og:image" content="<%= @map.screenshot_url %>" />
     <meta property="og:description" content="<%= @map.desc %>" />
+    <meta property="og:url" content="<%= original_url %>" />
 
     <meta name="twitter:title" content="<%= @map.title %>" />
     <meta name="twitter:image" content="<%= @map.screenshot_url %>" />
     <meta name="twitter:description" content="<%= @map.desc %>" />
+    <meta name="twitter:url" content="<%= original_url %>" />
   <% end %>
 
   <%= stylesheet_link_tag    "application", :media => "all" %>