Yeah, this is a bit of a pain. We have to something similar for facebook (https://www.facebook.com/note.php?note_id=10150492832835766). There's talk of a meta referrer tag (http://wiki.whatwg.org/wiki/Meta_referrer) that would allow overriding this behavior and making things a lot simpler, but afaik it's not implemented in any of the major browsers.