I did have stuff like this at various other points. I backed off because it is a bit difficult to explain and Google is constantly changing their SERPs.

There are two ways I found that are pretty simple though, and I wonder what you think of those.

1) A query on Google that has a ton of ads above results, e.g. though one could argue the top ad is useful. 

2) I remove 60M spam domains from results. The problem is I'm sure Google removes millions as well.

I had done a bit of studying of Google Web spam and wrote it up here:

The problem with that though is it says nothing of actual rankings, e.g. see comments at

posted by yegg Staff8 years and 6 months ago Link