ref attribute not getting registered in Facebook Insights
===

I am using the `put_wall_post` call of the Koala [gem](http://rubydoc.info/github/arsduo/koala/master/Koala/Facebook/GraphAPIMethods#put_wall_post-instance_method) to create notifications on the Facebook walls of an authenticated user's friends. I am also sending a `ref` attribute in the attachment hash which is the second argument to the call, as documented [here](http://rubydoc.info/github/arsduo/koala/master/Koala/Facebook/GraphAPIMethods#put_wall_post-instance_method).

The attachment hash looks something like this:

    {
      "message"=>"Some random message", 
      "name"=>"Some random name", 
      "description"=>"Some random description", 
      "picture"=>"http://someurl.com/images/some_feed_icon.png", 
      "ref"=>"some_ref"
    }

But this isn't working - I am not able to see `some_ref` as a Story Type in the Insights Dashboard. Any ideas?