Fake referrer page
I got a referrer from a refer.php page. That’s a commonly used referrer script. But I got suspicious. I was pretty sure I hadn’t linked to the domain it was on. So I looked.
And found a page that had referrers, but didn’t look like it was powered by that script. And all the referrers were typical splogs on blogspot. The main page of the domain the “script” was on was a scraper.
New tactic, in other words. Insert a referrer page into other people’s referrer scripts - hopefully some are public. Then sit back and wait for the search engines to come by.