Sales Loves MarketingA private blog network (PBN) is a set of websites controlled by one owner and used to link to a main "money" site so that it ranks higher in search. The sites look like independent blogs, but they exist mainly to pass link authority. Google treats this as link spam.
How does a private blog network work?
- Buy domains with a history. Owners often buy expired domains that still have backlinks from their previous life.
- Put up thin sites. Each domain gets a simple blog with just enough content to look real.
- Link to the money site. Posts on each blog link to the main site, often with keyword-rich anchor text.
- Hide the connection. Owners try to make the sites look unrelated, with different hosts, themes and registration details.
The idea is that the old domains' reputation flows to the main site through those links.
Why does Google treat PBNs as spam?
Google's spam policies define link spam as creating links mainly to manipulate rankings. Among the examples they list is creating low-value content primarily to manipulate linking and ranking signals, which is what a PBN does.
Since March 2024 Google also has a specific policy on expired domain abuse: buying an expired domain and reusing it mainly to rank low-value content on the strength of its past reputation. Google's example is a former medical site repurposed to host casino content. It adds that this practice "isn't something people accidentally do".
Google finds spam through automated systems and human review. Sites that violate the policies may rank lower or disappear from results, and a reviewer can issue a manual action for unnatural links.
What does a PBN look like?
Common signs, or footprints, include:
- Blogs on unrelated or shifting topics, with an old domain that once belonged to something else.
- Thin, generic posts that each happen to link to the same commercial site.
- Few real visitors, comments or social shares.
- Several sites linking to each other and to one target in the same pattern.
What should you do instead?
PBNs are a black hat tactic. If you buy links from a seller who can't explain where they come from, they may come from a PBN. Safer ways to earn links:
- Publish original research, data or tools that others want to cite.
- Write genuine guest content for relevant sites, and qualify any paid placement with
rel="sponsored". - Build relationships with partners, customers and the trade press.
- Pitch real news and stories to journalists as part of your link building.
If you inherited a PBN problem, see unnatural links for how to clean it up.
Related terms
Frequently asked questions
Are private blog networks illegal?
No. PBNs are not against the law, but they break Google's spam policies. The risk is in search, not in court; sites that use them can rank lower, drop out of results or receive a manual action.
Why do people still use PBNs?
Because links remain one of the signals search engines use, and a PBN puts the links under the owner's control. The trade-off is risk. If Google discounts the network's links or acts against the site, the investment and the rankings it bought can disappear together.
Is buying an expired domain always a problem?
No. Google says it is fine to use an old domain for a new, original site that's designed to serve people first. It becomes expired domain abuse when the domain is bought mainly to borrow its past reputation for low-value content.