GEO and SEO · Investigation
The bad backlink practices that can sink you
Buying links, exchanging them in bulk, or putting your site into a private blog network isn't a shortcut, it's a way of asking Google to review your site under a magnifying glass. This guide gathers, with sources, which link building practices search engines penalize, how they detect them, and how that same risk applies when what you want is to be cited by an AI.
By the ArribaIA team · Updated
Why I'm writing this
I was testing an AI marketing app and found a link farm built in
I've spent weeks testing AI marketing tools to understand what they actually automate versus what just promises shortcuts. One of them, built for generating content and gaining visibility automatically, includes a feature presented as "link exchange": it connects your website with hundreds of other users' sites on the platform so you link to each other without negotiating case by case.
Put that way, it sounds like networking. In practice it's almost the literal definition of a link farm: a group of sites with no real topical relationship to each other, joined solely to artificially inflate each one's inbound link count. There's no editorial judgment behind it, no relevance criteria, no human deciding that link adds value for the reader. There's an algorithm pairing up websites so they link to each other in exchange for nothing more than reciprocity.
What's concerning isn't that the feature exists, it's that it's built in as a product advantage, with no warning about what Google's own official documentation says about it. That led me to dig into what actually distinguishes a link that carries real authority from one that's simply spam with a different name, and to document the rest of the practices that fall into the same category even when they're sold under more presentable labels: "collaborations," "partnerships," "networks."
This isn't an accusation against any specific tool. It's a warning: if a platform offers you easy, at-scale links, you're almost certainly looking at a modern version of a practice search engines have been fighting for over twenty years, and one that now also compromises your credibility with the AI systems that cite sources. The rest of this article is that investigation.
Citable summary
Google explicitly defines link spam in its spam policies for Search as any link created, bought, or exchanged with the goal of manipulating rankings, and that includes link farms, mass exchanges, private blog networks (PBNs), large-scale guest posting with optimized anchor text, and links hidden in widgets or footers. These practices can trigger both algorithmic actions (losing positions with no prior warning) and manual actions flagged in Search Console, and real documented cases like JCPenney or Interflora show the drop can be immediate and public. The alternative isn't to stop building authority, it's to earn it from sources nobody can buy for twenty euros, something we also cover for local businesses in our local business authority guide.
This summary condenses the guide into under 130 words on purpose: it's the kind of fragment an AI can cite without needing to read the rest of the page.
Risk taxonomy
Ten backlink practices Google penalizes
They don't all carry the same weight or get detected the same way, but they all share the same underlying problem: the link exists to manipulate a ranking, not because someone considered it useful for their audience.
Link farms
High riskNetworks of sites with no topical relationship, created or coordinated for the sole purpose of linking to each other and distributing artificial authority.
There's no editorial judgment involved. Google identifies them by anomalous linking patterns between domains with no topical, geographic, or business reason to be connected.
Mass link exchanges
High risk"I'll link to you if you link to me" taken to scale, often automated through exchange platforms or communities.
Google explicitly flags this as a link scheme in its documentation: an excess of reciprocal links between the same sites is a classic manipulation signal.
Buying and selling links that pass authority
High riskPaying (in money, free product, or any other incentive) for a link that doesn't carry the rel="sponsored" or rel="nofollow" tag.
It's the most cited example in Google's link policy, and the one behind the public penalties against JCPenney and Interflora.
Private blog networks (PBNs)
High riskA single owner runs dozens of domains, often expired and carrying some prior authority, for the sole purpose of linking from them to their main site.
Google has deindexed entire PBN networks at once after detecting the same hosting, template, or registrant pattern behind multiple domains.
Large-scale guest posting with optimized anchors
High riskPublishing guest articles on dozens or hundreds of blogs with the explicit goal of inserting a link using the exact keyword you want to rank for.
Google distinguishes between the occasional collaboration with a relevant outlet and using guest posting as an industrialized link-building channel; the latter falls under its definition of a link scheme.
Comment and forum spam with mass links
Medium riskLeaving the same link, or variations of it, across hundreds of blog comments, forums, or Q&A sections, almost always with automated software.
It's user-generated content spam, a category Google treats as both link spam and content spam, and in practice it no longer carries authority since most of these links are nofollow.
Over-optimized anchor text
Medium riskForcing an abnormally high share of your inbound links to use exactly the same commercial keyword as anchor text.
A natural link profile has varied anchors (brand, bare URL, "here," generic phrases). Anchor over-optimization was one of the signals Google's Penguin algorithm started penalizing in 2012.
Low-quality directories and mass-generated articles
Medium riskSigning up for hundreds of generic directories with no editorial review, or publishing the same article (or automated variations of it) across dozens of sites purely to place a link.
Google treats this as low-value content created mainly to attract search traffic, the exact opposite of what it describes in its documentation on helpful, people-first content.
Hidden links in widgets, themes, or footers
Medium riskA link embedded in a widget, template, or plugin distributed for free in exchange for whoever installs it keeping (or being unable to remove) a link back to the creator.
The link isn't consciously chosen by whoever publishes the page; it's placed systematically on sites with no real editorial relationship to the destination.
Link cloaking and deceptive redirects
High riskShowing search crawlers a different link or page than the one a real user actually sees, to hide a link scheme behind a legitimate-looking facade.
It's a direct manipulation of what the crawler sees versus what a person sees, and it's explicitly flagged as technical spam in Google's documentation.
How Google detects it
You don't need to get reported
For years, the Penguin algorithm (launched in April 2012) was the best-known piece of Google's fight against link spam: it analyzed anchor text patterns, link acquisition speed, and the quality of source domains to automatically demote sites that manipulated their link profile.
Since 2018, much of that work has been taken over by SpamBrain, the machine-learning-based system Google uses to detect spam at scale, including networks of sites created to buy and sell links that pass authority. Unlike Penguin, SpamBrain updates continuously, without the cycle of periodic updates that used to let a link scheme "work" for years before being caught.
Beyond purely algorithmic actions, Google can also apply manual actions: someone from the search quality team reviews a site (often after a report or a piece of investigative journalism), and if they confirm a link scheme, they notify it directly in Search Console with the exact reason. This is the path behind the best-known documented cases.
An automatic loss of rankings with no individual notice, applied by systems like SpamBrain upon detecting manipulation patterns.
A human review confirming a violation of the spam policies, explicitly flagged in Search Console with the reason and, often, room to submit a reconsideration request.
A file that lets you ask Google to ignore specific links pointing to your site, built for businesses affected by someone else's spam or a past link scheme they want to leave behind.
Not theoretical
Real, widely documented cases
These aren't hypothetical examples: they're episodes that made both trade and mainstream press precisely because the drop was public and immediate.
| Case | What happened | Consequence |
|---|---|---|
| JCPenney2011 | A New York Times investigation uncovered thousands of paid links placing the US retail chain in first position for hundreds of commercial terms unrelated to its brand. | After confirming the scheme, Google applied a manual action that made JCPenney disappear from the first pages of results for nearly all of those searches. |
| Interflora2013 | The flower delivery chain was flagged for a paid link scheme detected by Google in the UK. | It disappeared for several weeks from Google's top results, even for searches on its own brand name, an episode widely covered by trade press. |
| Penguin launch2012 | Google publicly announced an algorithm change aimed specifically at sites that, in its own words, violated webmaster guidelines through keyword stuffing and link schemes. | Numerous sites that had built their traffic on over-optimized anchor text and low-quality links lost rankings simultaneously and en masse. |
| Dismantled private blog networksRecurring | Periodically, Google identifies networks of domains (often expired and repurchased) operated by the same owner for the sole purpose of linking to each other. | The usual consequence is simultaneous deindexing of the entire network, not just the domain receiving the links, recurringly documented by SEO trade press. |
Self-diagnosis
Signs your link profile might be a problem
You don't need to have deliberately hired a link scheme. Sometimes it's enough to have outsourced link building to a provider without asking the right questions.
- A sudden, unexplained jump in your number of referring domains within a few weeks.
- A high share of inbound links using exactly the same keyword anchor text.
- Links from sites in languages or sectors completely unrelated to yours.
- Manual action notifications in Search Console related to artificial links.
- An agency or tool promising a fixed number of "guaranteed" links per month.
- Reciprocal links with dozens of sites with no real business relationship with you.
- Backlinks you don't remember requesting, coming from generic directories or widgets installed by third parties.
The alternative
What to build instead
None of this replaces having something that genuinely deserves a link or a mention. The authority that can't be bought is precisely the kind that matters most.
Original content others want to cite
Proprietary data, real case studies, and verifiable answers to specific questions earn links because someone decides, without you asking, that your page adds something. It's the same logic we cover in what GEO is.
Mentions nobody can fake
Chambers of commerce, professional associations, universities, town councils, and local media link because of a real relationship, not an exchange. If your business has a physical location, this is exactly what we cover in our local business authority guide.
Digital PR, not link exchanges
Working with a media outlet or a creator in your industry because there's a real story to tell is different from asking for a link in exchange for another. The difference is whether the relationship would survive without the link involved.
Measuring your real authority, not just counting links
A healthy link profile gets reviewed with the same discipline as any other business asset. It's part of what we cover in mention monitoring.
An already-researched library, not a promise
If you'd rather not build links blindly, we've done the fieldwork for you: our local backlinks library gathers directories, associations, and media across Dénia and the Marina Alta, verified one by one, with their real priority and relevance, not a purchased list or an automated exchange.
A method, not a shopping list
If after reading all this you want to know exactly where to start, we've written the companion guide: how to get free backlinks, step by step and by business type.
Quick checklist
Before accepting a link or a link building service
- 01Would the link exist if there were no money, product, or reciprocity involved?
- 02Does the source site have a real topical relationship with yours?
- 03Did a human editor decide to publish it, or did an automated exchange system?
- 04Is the anchor text natural, or does it repeat your exact commercial keyword?
- 05Do you know exactly which sites your link will appear on, or is it delivered as a "package"?
- 06Does the provider promise a fixed number of guaranteed links per month?
- 07Do you periodically check Search Console for a manual action?
- 08Do you know Google's spam policies, or do you outsource that responsibility without checking?
Frequently asked questions
What people ask most
Can a single purchased link penalize my entire site?
An isolated link rarely triggers a manual action on its own, but it becomes part of a pattern Google does analyze in aggregate. The real risk shows up when the pattern repeats: several paid links, with similar anchors, acquired in a short time.
Even so, it's not a risk worth taking for a single link: the safest way to judge it is to ask whether that link would exist without the payment involved.
Are rel="nofollow" or rel="sponsored" links always safe?
Correctly marking a paid or collaboration link with rel="sponsored" (or rel="nofollow" failing that) is exactly what Google asks for so it isn't treated as an attempt to manipulate rankings, so it directly reduces the risk.
That doesn't turn it into a source of ranking authority, precisely because it's telling Google not to count it for that. It can still drive traffic, brand awareness, and visibility, just not the signal people who buy unmarked links are after.
How do I know if my SEO agency put me in a link scheme?
Always ask for the full list of domains building links to your site, not just the total count. If the agency can't (or won't) give you that list, that's a red flag on its own.
Also check whether they guarantee a fixed number of links per month: legitimate link building depends on real opportunities, not a predictable volume like a factory line.
Does the disavow tool fix this?
Yes, but for a specific case: when you have toxic links you can't remove directly (someone else's spam, a past scheme, third-party negative SEO) and you want to ask Google to ignore them when evaluating your site.
It's not a tool for "cleaning up" an active scheme of your own, nor does it replace stopping the practice. If you keep buying or exchanging links while disavowing others, the underlying problem continues.
How long does a link penalty take to lift?
For an algorithmic action, recovery generally happens gradually once the problematic links are removed or disavowed and the system re-evaluates the site, with no guaranteed fixed timeframe.
For a manual action, you need to fix the issue, document it, and submit a reconsideration request through Search Console; Google reviews those individually, so the timeframe varies by case.
Does this also affect whether ChatGPT or Gemini cite me?
Indirectly, yes. Generative systems that rely on the web depend partly on indexes and quality signals that are part of technical SEO, so a penalty that tanks your search visibility also reduces the odds an AI system finds you as a source.
Also, many of these practices (mass-duplicated content, link farms, directories with no editorial standard) generate exactly the kind of low-quality noise that makes it harder for an AI to trust a source, beyond the direct ranking effect.
Is an occasional link exchange between two related sites the same as a link scheme?
Not necessarily. Google distinguishes between a one-off, justified exchange (two complementary businesses recommending each other, for example) and a systematic, large-scale pattern of reciprocity, which does fall under its definition of a link scheme.
The practical difference lies in scale and in whether there's a real relationship behind each link, not in whether you've ever linked to someone who also linked to you.
Sources
What we rely on
We always distinguish between a platform's official documentation, academic studies, verifiable news coverage, and industry analysis. A press anecdote isn't the same as an official policy, and we flag it in every case.
- Official documentation
Google Search spam policies: link spam
Google Search Central
Google's official definition of what constitutes a link scheme: buying and selling links that pass PageRank, mass exchanges, using automated programs to create links, and excessively optimized anchor text, among other explicit examples.
developers.google.com/search/docs/essentials/spam-policies#link-spam - Official documentation
Creating helpful, reliable, people-first content
Google Search Central
Google's official documentation on what characterizes content its system considers helpful and reliable, the direct contrast to mass-generated content that exists only to host links.
developers.google.com/search/docs/fundamentals/creating-helpful-content - Academic study
Web Spam Taxonomy
Zoltán Gyöngyi and Hector Garcia-Molina (Stanford InfoLab)
One of the reference academic papers on web spam, presented at the AIRWeb 2005 workshop. Systematically classifies link manipulation techniques, including link farms and exchange schemes, establishing much of the vocabulary still used today.
- Academic study
Combating Web Spam with TrustRank
Zoltán Gyöngyi, Hector Garcia-Molina, and Jan Pedersen (Stanford InfoLab)
A study presented at VLDB 2004 that proposed one of the first algorithmic methods for detecting spam pages from the web's link structure, the conceptual foundation for much of the antispam systems that followed.
- News coverage
The Dirty Little Secrets of Search
The New York Times (David Segal)
The 2011 investigative report that uncovered JCPenney's paid link scheme and triggered Google's manual action against the chain, one of the most cited link-penalty cases in the industry.
- News coverage
After Penalizing Interflora & UK Newspapers, Google Warns Against Advertorials
Search Engine Land
Contemporary coverage (March 2013) of Interflora's penalty for a paid link scheme through advertorials in British newspapers, and Google's subsequent warning against that practice.
searchengineland.com/after-penalizing-interflora-uk-newspapers-google-warns-against-advertorials-149371 - Professional analysis
Peec AI
Peec AI
An AI search visibility monitoring platform that helps distinguish legitimately earned visibility from anomalies in how a brand gets cited, one of the frameworks we use to check the effect of a healthy link profile.
peec.ai
Do you know if your link profile is helping you or putting you at risk?
We audit your inbound links, identify risk patterns, and tell you what's worth disavowing, what's worth keeping, and where to build real authority from here.