I'd just like to confirm what has been reported here is exactly what I'm seeing. In my Apache server log, I AM seeing the referrer string from Stumbleupon. It looks like
http://www.stumbleupon.com/refer.php?url=http%3A%2F%2Fwww.antezeta.com%2Fblog%2Frip-ask-com%2F where url=xxx is the target parameter, i.e. page to which Stumbleupon sends the user.
Thus, it appears that this shouldn't be too difficult to resolve, and may indicate other issues - or - stumbleupon.com has been inserted into a list of known search engines.. and the intent is that it should appear there in reports....
Thanks.
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