PBN stands for Private Blog Network. It refers to a group of websites—often expired domains with existing backlink profiles—that someone controls for the sole purpose of linking out to money sites to boost their rankings. The theory is that links from seemingly independent sites with authority pass ranking power, but Google's algorithms have become sophisticated at detecting footprints like shared hosting IPs, identical WHOIS information, similar site structures, or cross-linking patterns. PBNs were more common between 2008 and 2014, before Google's manual action teams and algorithmic updates became aggressive about devaluing and penalizing manipulative link schemes. When a PBN gets detected, every site in the network risks deindexing, and any money site receiving links from it can face manual penalties that tank rankings for months or permanently. The cost structure never made sense at scale either. You're paying for domain acquisition, hosting across different C-class IPs, content creation for each PBN site, and ongoing maintenance to avoid detection. That same budget could fund legitimate outreach, digital PR, or content partnerships that build real authority without the existential risk. At Ottawa SEO Inc., we've cleaned up after PBN penalties for clients who inherited them from previous agencies. The recovery process involves disavowing toxic links, filing reconsideration requests, and rebuilding authority through white-hat tactics—usually taking 6 to 18 months to regain lost ground. We've never built PBNs for our 500+ domain portfolio because the risk-reward equation doesn't work when you're managing assets long-term. Some operators still run PBNs in low-competition niches or for short-term affiliate plays, accepting that burnout is inevitable. But for any business with brand equity or multi-year revenue projections, PBNs represent unacceptable downside risk. The same effort invested in guest posts on real publications, resource page outreach, or creating linkable assets delivers compounding returns without the threat of overnight deindexing.