Advanced GEO in the AI Era — Your Own Site Is Just the Foundation. Off-site Is a 5.7× Bigger Battlefield

Industry research finds that roughly 85% of brand mentions in AI answers come from third-party pages and only 15% from a brand's own site — off-site mentions are roughly 5.7× the volume of owned mentions. This doesn't mean your own site is unimportant (52% of Gemini's citations still come from brand-owned domains, the foundation of your GEO body), but doing your own site is just the ticket of entry — the remaining 5.7× battlefield is off-site. This post unpacks the four quadrants of off-site authority in the AI era: knowledge bases, video, local forums, and third-party reviews.