What Is Link Spam?
Written byFlavio Amiel Founder, Roborank
Link spam is the practice of creating links to or from a site primarily to manipulate search rankings rather than to genuinely reference useful content. Google’s spam policies treat it as a violation and include buying or selling links, excessive link exchanges, forced links, and automated link building. Modern systems mostly nullify these links instead of ranking the page.
- Google’s own definition is precise: link spam is ‘creating links to or from a site primarily for the purpose of manipulating search rankings.’
- The spam policy names specific tactics: buying or selling links, excessive link exchanges, requiring links in a Terms of Service, automated link creation, and advertorials that pass ranking credit.
- Google’s December 2022 link spam update used its SpamBrain AI to detect both sites buying links and sites used to pass outgoing links, then nullified those links rather than penalizing every page.
- Buying and selling links is legitimate for advertising as long as the link is qualified with rel=‘sponsored’ or rel=‘nofollow’ so it does not pass ranking credit.
How Link Spam Works
Search engines treat a link as a signal of trust: when one site links to another, it lends a fraction of its credibility, and pages that accumulate many credible links tend to rank better. Link spam is the attempt to fake that signal. Instead of earning a reference because the content deserves it, someone manufactures the link — paying for it, trading for it, automating it, or coercing it — purely to inflate rankings.
Google’s spam policies state the rule plainly: link spam is “creating links to or from a site primarily for the purpose of manipulating search rankings.” The word primarily is doing the work. A paid banner ad contains a link, but its purpose is advertising, not ranking manipulation, so it is fine as long as it is qualified. The line is intent, made visible through how the link is marked and how it was acquired.
The policy enumerates the tactics that cross that line: buying or selling links that pass ranking credit, excessive link exchanges, requiring a link as part of a Terms of Service or contract, using automated programs to build links, advertorials or native ads that pass credit, low-quality directory and bookmark links, keyword-rich widget or footer links, and forum comment links with optimized signatures. Running a private blog network to link to your own money site is a textbook case.
How Google Handles It
The modern response to link spam is mostly neutralization. Rather than manually reviewing every suspicious link, Google runs SpamBrain, an AI system that identifies manipulative links and strips their ranking value. Manual actions — human-issued penalties visible in Search Console — still exist for egregious or repeated cases, but for most sites the practical outcome is that the spammy link simply stops counting. Legitimate links you would build for real reasons are unaffected. Where you cannot get a bad link removed, the disavow file tells Google to ignore it.
Example of Link Spam
The clearest documented illustration is Google’s December 2022 link spam update, announced on December 14, 2022. Google described it as extending its SpamBrain AI beyond detecting spam directly: the update was built to “detect both sites buying links, and sites used for the purpose of passing outgoing links.” That is significant because it catches link schemes from both ends — the buyer trying to inflate its own rankings and the network of sites selling the outbound links.
Google was explicit about the consequence. As the update rolled out, “any credit passed by these unnatural links” would be lost, and the affected links would be nullified rather than counted. The rollout took roughly two weeks to complete and affected all languages. Google’s guidance to site owners was equally direct: this is not a signal to buy your way out, it is a reason to stop, because the links you paid for would no longer do anything.
The lesson generalizes. A link scheme that would have quietly boosted a site in 2015 is, by design, worth nothing in the current system — and the money and effort behind it are pure loss. The only links that survive an update like this are the ones a real editor chose to place.
It is worth being precise about what “nullified” means, because it changes how you react. A nullified link is not a mark against your site; it is simply a link Google no longer counts. That is why chasing the previous ranking by buying more of the same links is futile — each new batch meets the same fate. The rankings you held on the strength of a scheme were always on loan, and an update like this is Google calling the loan.
The biggest shift people miss is that link spam is now mostly neutralized, not punished. For years the fear was a manual action wiping out a site, so agencies sold panic. Today Google’s default response to a manipulative link is quieter: SpamBrain simply nullifies it, so the link passes no credit and the ranking you paid for never materializes. That reframes the whole economics of shady link building — you are not usually buying a time bomb, you are buying nothing. The real cost is the money spent and the opportunity lost, not a guaranteed penalty. Chase links a person would actually click, and you never have to think about which bucket Google files them in.
Staying on the Right Side of the Policy
Compliance is mostly about intent and disclosure. Earn links by publishing things worth citing, and qualify anything transactional. A sponsored placement or affiliate link marked with rel="sponsored", or a user-generated link marked with rel="ugc", tells Google not to treat it as an editorial vote — which is exactly what keeps it out of the link spam bucket. Watch your incoming links the way you watch anchor text distribution: a sudden flood of keyword-rich links from unrelated sites is the pattern SpamBrain is trained to nullify, and occasionally the pattern that earns a manual action.
Frequently Asked Questions
What is link spam?
Does link spam still get sites penalized?
Is buying links always against Google's rules?
How does Google detect link spam?
The Bottom Line
Link spam is the attempt to buy or engineer ranking authority through links a person would never place on merit. Google’s policy bans it, but its enforcement has quietly moved from punishment to nullification: the typical fate of a manipulative link is to be ignored, passing zero credit. The durable strategy is earning links editorially and qualifying any paid placement so it never pretends to be a vote.
Sources
- Spam policies for Google web search — Link spam — Google Search Central
- December 2022 link spam update releasing for Google Search — Google Search Central Blog
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