A PBN, short for Private Blog Network, is a group of blogs owned by one person or company that link to other sites to raise their rankings in search results. Google's spam policies classify this practice as link spam.
History of PBN
Creator: No single creator. Link farms were first built by search engine optimizers. Year: 1999.
search engine optimization (SEO) specialists built the first link farms in 1999. Their target was the Inktomi search engine. Inktomi ranked pages by link popularity. Yahoo! also used Inktomi results to supplement its directory search. A link farm could therefore affect the results of two services.
Some link farms ran automated programs. Services registered sites. They sorted the sites into categories. They updated the link pages of members. Other tools found link partners that linked back. These tools sent template emails to request exchanges. Search engines responded. They filtered out the pages that showed these patterns from their indexes.
When Google became the main search engine, it ranked pages with PageRank. PageRank is a weighting scheme for links. Link farm members then aimed at PageRank. Some members received links from other sites. They hid their links to other sites. This forced link farm operators to add quality controls. They also had to monitor each member.
A private blog network is a group of blogs owned by the same entity. The blogs can be connected loosely. They can also be owned by one company. Wikipedia states the purpose. It is to promote sites outside the network. It is to raise search rankings. It is to raise revenue from advertising on those sites. In September 2014, Google applied manual action ranking penalties to PBNs.
A hosted blog platform is a separate case. The Multisite feature of WordPress is an example. Each blog in that network uses a subdomain or a subfolder. Each blog runs on its own. A PBN can be exposed when one blog links to the others. The links reveal the group.
Changelog and latest update
Google's spam policies list link spam as a violation. The policy names these practices. Buying or selling links for ranking is one. Excessive link exchanges are another. Automated link creation counts too. So do links in footers placed across many sites. The policy also says that paid links are acceptable only with a rel attribute. Links that users post are too. Examples are rel="sponsored" and rel="ugc".
In September 2014, Google targeted PBNs with manual action penalties. The Wikipedia link farm article gives 23 September 2014. That is the date of the report that describes these penalties. Google states that it finds these practices with automated systems and human review. Sites that break the policy can rank lower. They can also be left out of results entirely.
The Google guidance on outbound links was last updated on 10 December 2025. The Google spam policies page was last updated on 28 August 2026. Users can send a search quality user report. Google asks users to report suspected spam that way. Google uses those reports to improve its automated spam detection.
Latest update: Google Search spam policies, 2026-08-28
The Google spam policies page shows the line "Last updated 2026-08-28 UTC". The page keeps link spam as a listed violation. It states that Google may act against any type of spam it detects. It also states that a manual action can remove a site from results. Site owners can check the policy text. They can do this before they publish any link.
Usage examples
A PBN (private blog network) has no code of its own. Site owners and auditors check for one. They look for signs that Google's policies name. Such signs include shared server addresses, shared registrant records and link patterns going out to other sites. The four examples below run checks on sites you own or audit. They change no site. They send no links.
for d in blog1.example blog2.example; do
echo "$d $(dig +short A $d | head -1)"
doneThis loop asks the domain name system (DNS) for the Internet Protocol version 4 (IPv4) address of each domain. Blogs in one network often share an address. So two domains that return the same address need a closer look. The dig command comes from the bind-utils or dnsutils package.
for d in blog1.example blog2.example; do
whois $d | grep -i registrant
doneThis loop prints the registrant line from each domain record. Registrant names that match across many blogs are a sign of common ownership. Privacy services hide the name. When no names match, that does not prove the owners differ. Check the name server lines too. Use the same grep pattern.
URL=https://blog1.example/
curl -s $URL \
| grep -o '<a [^>]*>' \
| cut -c1-40This script lists each link tag on a page. It shows the first 40 characters of each tag. Look for links to other blogs in the same group. A link with no rel attribute passes ranking credit. Search engines treat that type as a vote.
<a href="https://client.example/"
rel="sponsored">Client site</a>
<a href="https://forum.example/"
rel="ugc">Forum post</a>Google asks sites to mark paid links with rel="sponsored". The attribute tells Google that the link was bought or given for payment. So the link does not pass ranking credit. The rel="ugc" value marks links that users post. Those links appear in comments or forums.
References
These sources are outside Websnoogie and were checked on 2026-10-12.
Spam policies for Google web search
Google Search Central
Google's list of practices that violate its web search spam policies. The Link spam section names buying or selling links for ranking, excessive link exchanges and automated link creation. The page shows its last update date, 28 August 2026. The page also lists the manual actions that Google uses when a site breaks these rules, and it links to the search quality user report form.
Qualify your outbound links to Google
Google Search Central
Google's guide to the rel attributes sponsored, ugc and nofollow. It explains which attribute marks paid links and user-generated links. It states that links with these attributes are generally not followed. The page was last updated on 10 December 2025. The guide shows example markup for each attribute.
Link farm
Wikipedia
The encyclopedia article on link farms, which covers private blog networks in its own section. It describes the 1999 origin of link farms, the 2014 Google manual action penalties and the exposure of a network through outbound links, with citations. The article is a useful first source for the history of the practice, since it names the search engines and the ranking methods that link farm operators targeted.
Spamdexing
Wikipedia
The encyclopedia article on spamdexing, the practice of manipulating search engine indexes. It lists link farms and private blog networks as forms of the practice. It gives the earliest known use of the term, in a 1996 newspaper article.
Google Targets Sites Using Private Blog Networks With Manual Action Ranking Penalties
Search Engine Land (archived copy)
Barry Schwartz reports on September 23, 2014 that Google sent manual action notices for thin content to private blog networks on September 18. The article describes what a PBN is and how the notices reached site owners. It is the dated news source behind the 2014 penalty claim.
Links we earn one site at a time
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