I was just thinking about what I would do if I were google to prevent linkspam...well, not prevent linkspam, but to prevent sites that would otherwise rank well BECAUSE of effective linkspamming, from appearing in the SERPs. I think that some critical thinking like this for hypothetical situations is just "good for business" as it can often help you foresee/anticipate what may be coming. It also helps you realize what you may be doing wrong or could be doing differently. Anyway, back to my point. I think it would be this easy for Google, and I'm just looking to make kind of a "think tank" type discussion on the topic to help evolve some of my current linkspamming tactics. So, what google could do: Simply inject sites into their SERPs that ONLY APPEAR when a footprint has been searched....any footprint at all (and they've got them all...). Have it inconspicuously show up maybe on the 3rd page of the serps and it would have a regular name just like any other website. So a person searches for: "leave a reply" -"comments are closed" "name" "email" and on the third page there is a site called "http://technologynow.com/what's-hot-right-now.htm" <- but really, there is not content on this page. Or, even better, there IS content on the page. It looks like a regular blog in every way shape & form...but this blog ONLY EVER APPEARS in the SERPs when a footprint is searched. So the only way this site would ever have an outbound link would be is if it were found by somebody using footprints...who are the only people that use footprints? That's right! Linkspammers are the only people searching footprints! We use automated software to search thousands of footprints all the time. And even if we were to review each and every page/forum/blog manually, it would look fine! They could do this for EVERYTHING. Forums, blogs, wiki's, "twitters", facebook pages, anything at all! These fake pages would literally ONLY EVER APPEAR if they a footprint in googles database was searched. So, they take the outbound links that get found on these "honeypot" pages, and check where their inbound links are coming from. It would be IMMEDIATELY recognizable that the "money site" linked to was linkspamming and WHAM! gone from the index you would go. Granted, the algorithm would have to have a little more complexity than that (obviously) but that's the basic idea. What do you think?