Change the way the orig_url is passed to fb

app/assets/javascripts/lib/social-share-button.coffee

@@ -9,7 +9,7 @@ window.SocialShareButton =
     img = encodeURIComponent($(el).parent().data("img"))
     fb_url = encodeURIComponent($(el).parent().data("fb_url"))
     url = encodeURIComponent(location.href)
-    fb_full_url = encodeURIComponent("#{fb_url}?orig_url=#{location.href}")
+    fb_full_url = encodeURIComponent("#{fb_url}?orig_host=#{location.host}&orig_path=#{location.pathname}")
     switch site
       when "weibo"
         SocialShareButton.openUrl("http://v.t.sina.com.cn/share/share.php?url=#{url}&pic=#{img}&title=#{title}&content=utf-8")