Reddit lost the AI engines in September 2025. The citation share that made every brand rewrite the playbook collapsed inside ChatGPT and Google AI Overviews overnight. Here is what happened — and what to do about it.
Six academic studies that define how ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews cite the web. Authors named, methods explained, every number sourced. The reference document for practitioners, researchers, and journalists in AI visibility.
AI engines have replaced demographic audience segmentation. ChatGPT, Claude, Gemini, and Perplexity group buyers by the prompts they type — surfacing 14 primary consumer segments that are intent-shaped, not demographic.
Product discovery, once category-driven, is now outcome-based thanks to ChatGPT. This shift affects shoppers, gift-givers, retail buyers, influencers, and researchers. Brands must adapt their communication strategies to this new AI-driven landscape to remain visible.
OpenAI president Greg Brockman and his wife donated $25M to MAGA Inc. — the super PAC's largest donor by $5M — plus $25M to AI deregulation PAC Leading the Future. QuitGPT says 700,000 have pledged to cancel ChatGPT.
Five proprietary models. Five distinct citation logics. The category-level reference on who runs AI-mediated discovery — ChatGPT, Claude, Gemini, Perplexity, and Google AI Overviews — and the linked playbook for each.
When a tech publication picks up a luxury AI visibility study unprompted and frames it as a tech story, the category has crossed over. GEO is no longer a PR conversation.
When an AI engine answers a buying question, the brand it names just ran an ad. The brand it omitted paid for the impression. Welcome to AEO.
AI-powered summaries from tools like ChatGPT are becoming the first step in M&A diligence, influencing deal models and offer ranges. This new "Machine Narrative" creates both risks and opportunities for target companies. Strategic buyers, in particular, are heavily relying on AI summaries, leading to potential "retrieval distortion" that can compress offer prices. Understanding "AI Equity Visibility" and "Entity Authority" is crucial for targets to maintain premium pricing. Sell-side advisors need to conduct AI Visibility Audits and manage the target's online presence to prepare for this evolving M&A landscape.
RAG — the architecture behind ChatGPT browsing, Claude web search, Perplexity, Google AI Overviews. Why published content is now retrieval inventory, why GEO is the discipline, and what comms teams must operationalize.