A Private Blog Network is a collection of websites owned or controlled by one person or organization, created primarily to generate backlinks to a target site. The operator buys expired domains with existing backlink profiles, sets up basic WordPress sites on them, and publishes content that links to their money site or client sites. The economics look attractive on paper. An expired domain with decent metrics might cost $50–$300 CAD, hosting runs $3–$10 per month per site, and you control the anchor text and link placement completely. Build 20–30 sites and you've got a self-contained link factory. The problem is Google has spent years getting better at detecting footprints. Common detection signals include shared hosting IPs, identical WordPress themes, similar site structures, overlapping registration details, unnatural topical clusters, and linking patterns where multiple domains link to the same targets. When Google identifies a PBN, they devalue the entire network and often penalize the sites receiving links. We've seen competitors lose 60–80% of their organic traffic overnight after a PBN penalty. PBNs also decay. Expired domains lose authority over time if not maintained properly, so the initial backlink value erodes. You're left maintaining dozens of thin sites that produce no real business value beyond the links. At Ottawa SEO, we avoid PBNs entirely. The risk-reward ratio doesn't justify it when you're managing real businesses with revenue at stake. A single penalty can erase years of legitimate SEO work. We focus on earning links through content partnerships, digital PR, resource pages, and genuinely useful content that publishers want to reference. It takes longer, but the links stick and the sites remain penalty-free. If someone pitches you PBN links at $50–$150 per link, understand you're buying manufactured rankings on borrowed time. The question isn't if the network gets detected, but when.