Pick a page that’s valid, except for the parameter value you’re specify. For instance, check out a slashdot article with a bogus sid (story id). Note that this intentionally isn’t a link.
Doesn’t exist – page gives an error. Great. That’s what we expect.
Now, ask the search engines to give you the pages that link to that page.
Notice those first two – both give no results. That’s exactly what we expect – after all, noone will have linked to a page that doesn’t exist.
However, our friends at MSN claim to be paying attention to the parameters and aren’t:
Page 1 of 5,212 results containing link:http://linux.slashdot.org/article.pl?sid=doesnotexist (0.01 seconds)
You can check the results – they link to http://linux.slashdot.org/article.pl, sure, but not with the same sid value as we specified 🙂
Admittedly, I’m mainly posting this blog entry to make it simpler for me to send the feedback.