About 20 days ago the same thing happened, and I posted a nearly identical comment. Then, it was a link that was to localhost. Some folks definitely seem to be gaming the system. Only the bad links have allowed their detection.

Something like that happened to me, and I was very confused when I ended up at a website I had built a while ago - it was still running on that machine on localhost...I was scared that the website had made it to the frontpage, and sad when I realized it actually hadn't...