What Are Private Blog Networks (and Why Should You Care)?

The short version

A Private Blog Network — usually called a PBN — is a collection of websites that look independent but are secretly owned by the same person or group. They exist for one purpose: to create backlinks. The sites link to a target website to boost its search rankings, and then the PBN owner charges money for the service.

Google considers PBN links manipulative and in direct violation of their spam policies. If they catch you with PBN links in your backlink profile, it can lead to a penalty.

How PBNs actually work

The typical PBN starts with expired domains. When a legitimate website goes offline and the domain expires, someone can buy it. That domain still has all the authority and backlinks it earned when it was a real site. Google doesn't immediately know the site has changed hands.

The PBN operator buys dozens or hundreds of these expired domains, sets up basic websites on them (often using the same template with thin, generic content), and then publishes "articles" that contain links to their clients' websites. To Google's crawlers, it looks like a bunch of independent blogs are naturally linking to the client's site. In reality, it's one person operating all of them.

The more sophisticated PBN operators go to some effort to disguise the network. They'll use different hosting providers for each site, different WordPress themes, different registrar accounts, and different whois details. The less sophisticated ones — and there are a lot of these — use the same hosting, the same template, and the same writing style across every site in the network.

Why people use them

PBN links work. At least in the short term. Because the domains have real authority from their previous lives as legitimate websites, links from them carry genuine ranking power. A site that buys 50 PBN links can see a significant jump in rankings within weeks.

This is why they're tempting, and why dodgy SEO agencies love them. They can deliver visible results quickly, which keeps clients happy and paying. The problem is that the results come with a timer attached.

Why they're dangerous

Google has an entire team dedicated to detecting and devaluing PBNs. They've gotten very good at it. When they identify a network, they devalue every link from every site in it — often in a single update. Your rankings don't gradually decline. They crater overnight.

Even worse, if Google's webspam team manually reviews your site and finds PBN links, you can receive a manual action for unnatural links. This effectively removes your site from search results until you clean up the links and file a successful reconsideration request. Recovery takes months.

The fundamental problem with PBNs is that you're betting your entire search presence on someone else's ability to keep a secret. If the network gets detected — and eventually, most do — every site that benefited from it takes the hit.

How to spot PBN links in your backlink profile

If you've hired an SEO agency in the past (or bought links yourself), you might have PBN links without knowing it. Here's what to look for:

Thin, generic content. PBN articles are filler. They're usually 300-500 words of vaguely related content with a link dropped in the middle. The writing is often grammatically correct but says nothing of substance. It reads like someone was paid £5 to write about a topic they know nothing about — because that's exactly what happened. No real audience. Check the linking site's social media presence, comment sections, and traffic estimates. A real blog has readers. A PBN site has none. No comments, no social shares, no sign that any human has ever visited the page for any reason other than to check whether the link is live. Expired domain signals. Use the Wayback Machine to check if the linking domain used to be a completely different website. If a site that was a pet grooming blog in 2019 is now publishing articles about personal injury law with links to a lawyer's website, that's a PBN. Hosting and template patterns. If multiple sites linking to you share the same IP address, the same hosting provider, or the same WordPress theme with the same layout, they're probably part of the same network. Link placement. PBN links tend to be placed in a very specific way: embedded in the middle of an article paragraph, usually with exact-match anchor text. The surrounding text is written specifically to make the link look natural. Real editorial links are messier — they might be in a list of resources, a footnote, a sidebar, or mentioned in passing.

What to do if you find PBN links

If your backlink audit reveals PBN links, here's the practical response:

Don't assume the worst. A few PBN links among hundreds of legitimate links isn't a crisis. Google may already be ignoring them. The risk increases with volume — if PBN links make up a significant portion of your backlink profile, that's when you need to act. Add them to your disavow file. For confirmed PBN domains, disavow at the domain level. There's no point disavowing individual pages — if the domain is a PBN, every link from it is equally worthless. Stop buying them. This sounds obvious, but if you're currently paying for PBN links (or paying an agency that's building them on your behalf), stop. The short-term ranking boost isn't worth the long-term risk. Ask your agency directly: "Are any of these links from sites you own or control?" If the answer is yes, or if they won't answer, find a new agency. Don't try to contact PBN operators. Unlike legitimate webmasters, PBN operators have no incentive to remove your links. They might even try to charge you for removal. Just disavow and move on.

The bigger picture

PBNs are a symptom of a broader problem in SEO: the temptation to take shortcuts. Building genuine backlinks through content, relationships, and outreach is slow and difficult. Buying PBN links is fast and easy. But the fast option comes with an expiration date.

Google's detection of PBNs has improved dramatically over the past few years. Networks that operated undetected for years are being found and devalued. The window for PBNs to work without consequences is closing, and sites that relied on them are being left exposed.

If you're building a business you want to last, invest in links that last too. For a broader look at what makes any backlink toxic and how to deal with them, read our guide to finding and removing toxic backlinks. Real editorial links from real websites don't get devalued when Google updates their algorithm. They just keep working.

Think you might have PBN links in your profile? Our free backlink spam checker checks the spam score of your backlinks for free — a good first step before running a full audit.