PBN stands for Private Blog Network. It's a collection of websites—often built on expired domains with existing backlinks—that exist solely to link back to a target site (called a money site) to manipulate search rankings. The theory is that search engines see these links as legitimate editorial endorsements from independent sites, when in reality they're all controlled by the same person or entity. PBNs typically share common characteristics that make them detectable. Most use similar hosting footprints (same IP ranges, same registrars), thin or scraped content, identical themes or plugins, and unnatural linking patterns where multiple sites all link to the same money site but never to each other or external legitimate sources. The owners hide WHOIS information and avoid interlinking to maintain the illusion of independence. Google explicitly prohibits PBNs in its spam policies. When detected, consequences range from manual actions that tank rankings overnight to algorithmic devaluation where the links simply stop passing value. We've seen sites lose 60-80% of organic traffic within weeks of a PBN penalty. Recovery requires disavowing all PBN links and filing reconsideration requests, which can take months even when done correctly. The economics rarely justify the risk anymore. Building a PBN requires constant investment in domains (CAD $15-50 each annually), unique hosting (CAD $5-15 per site monthly), and content creation. For a 20-site network, you're looking at CAD $5,000-10,000 annually before seeing returns. Meanwhile, Google's detection keeps improving through machine learning that identifies patterns human reviewers might miss. At Ottawa SEO, we avoid PBNs entirely because the risk-reward ratio makes no sense for legitimate businesses. One penalty can erase years of work. Instead, we focus on scalable white-hat strategies: digital PR for earning editorial links, content partnerships with real publications, and creating linkable assets that naturally attract backlinks. These take longer but build durable authority that compounds rather than evaporating when the next algorithm update hits.