Unnatural links
Unnatural links are links that were created to try and game Google’s algorithms. Paid links are the obvious example. Buying links in articles is another. Creating large amounts of content to be published on other sites across the web so that you can get a link back is against Google’s guidelines as well.
When this discussion comes up, there is always someone who says, “Yeah, but how would Google know whether I bought this link or a competitor who is trying to do negative SEO did?”
In our experience, which amounts to ten years of actively working with sites to remove manual actions, we have yet to see a site that was given an unnatural links manual action solely because someone else was building links to the site. Every case that we have worked with to remove an unnatural links manual action is one that had actively been creating their own links to manipulate Google.
But could Google get it wrong algorithmically? Could their algorithms possibly demote a site unfairly because it has a very large volume of spammy links pointing to it?
Google’s John Mueller said that “where there is a clear pattern of spammy and manipulative links by [a] site, Penguin may decide to simply distrust the whole site.” He says that Google’s algorithms may lose trust in your site if, “our systems recognize that they can’t isolate and ignore these links across a website.”
If Google’s algorithms detect that there are links pointing to your site that represent attempts at manipulation, but they can’t easily determine which of those links are earned mentions and which are manufactured by you, then you may have a problem. Disavowing the links that were made for SEO purposes and keeping those that were naturally earned, can sometimes result in improvements.
But disavowing spam links, the types of links that we point out in our disavow blacklist, is not helpful here. We believe Google is easily able to isolate and ignore that type of link. We have not seen evidence to the contrary despite looking for it. Trust us, we would love to be able to recommend and do more disavow work!