It worked with Google too. I saw it a number of times: I couldn't understand why a certain document was included but when I searched I'd find the words listed

It worked with Google too. I saw it a number of times: I couldn't understand why a certain document was included but when I searched I'd find the words listed in an invisible string at the bottom of the page. Pagerank affected the ranking, not what keywords it should be found under. That said, today it is worse: pages show up in searches for keywords they don't even contain. One of the biggest reasons why I pay for Kagi.