As AI assistants like ChatGPT, Claude, and Gemini become primary search destinations for millions of users, a critical question has emerged for marketers and content creators: which websites do these models actually draw from when they compose their answers?
Thanks to a January 2026 dataset published by Semrush and highlighted by venture capital firm a16z, we now have a clearer picture. The findings are surprising and highly actionable.
Reddit Leads — And That Should Surprise You
For years, the conventional wisdom was that LLMs would lean heavily on encyclopedic, curated sources like Wikipedia. The Semrush data tells a different story. Reddit.com tops the chart at 11.29%, edging out LinkedIn (11.03%) and Wikipedia (9.53%).
Why? Reddit’s vast, conversational, and opinionated content maps well onto the kind of natural-language questions people ask AI assistants. When someone asks an LLM “what’s the best budgeting app?” or “is X neighborhood safe?”, Reddit threads — full of real human experience and debate — are exactly the kind of training data that produces confident, nuanced answers.
LinkedIn at #2: A Win for Professional Content
LinkedIn’s second-place ranking (11.03%) is equally striking. It suggests that professional, expertise-driven content — articles, thought leadership posts, company pages — carries significant weight in how LLMs understand business, industry, and career topics.
For B2B brands and professionals: if you’re not publishing on LinkedIn, you’re potentially invisible to the AI layer that an increasing number of your prospects use first.
The Long Tail: Medium, Forbes, and Q&A Platforms
Beyond the top four, the data reveals a few notable patterns:
- Medium.com (5.83%) — Long-form, opinionated writing continues to matter to AI models.
- Facebook (5.55%) & Instagram (3.70%) — Social platforms with massive public content footprints make the list, suggesting AI models have broader social data access than many assume.
- Forbes (3.43%) — Authority journalism still commands AI attention.
- Quora (2.82%) — Another Q&A platform confirming AI’s affinity for conversational, question-answering formats.
- Amazon (1.80%) — Product descriptions and reviews are in the mix too, relevant for e-commerce and product research queries.
What This Means for Your SEO & Content Strategy
This data is a window into Generative Engine Optimization (GEO) — the emerging discipline of optimizing your content not just for Google rankings, but for AI citation and reference. Here’s how to act on it:
- Be present on Reddit (authentically)Participate in relevant subreddits. Answer questions, share expertise, contribute to discussions. Spammy promotion won’t work — genuine participation will. LLMs pull conversational, authentic content.
- Publish on LinkedIn consistentlyShare original articles, insights, and case studies. LinkedIn’s professional context makes it a high-trust source for AI models on business and industry topics.
- Write in a conversational, Q&A formatBoth Reddit and Quora perform well. This signals that LLMs reward content that mirrors how humans actually ask questions. Use FAQs, listicles, and direct question-answer structures.
- Publish long-form content on MediumMedium’s ranking confirms that depth and nuance matter. A well-researched 1,500-word piece on Medium can carry more AI citation weight than a thin blog post.
- Claim and optimize your YouTube presenceVideo transcripts are indexed and cited. Ensure your YouTube content is well-described, has accurate auto-captions, and is paired with strong descriptions that contain your key terms.
The Bottom Line
The rise of AI as a primary search interface means the rules of content distribution are changing. The platforms LLMs cite most Reddit, LinkedIn, Wikipedia, YouTube, aren’t necessarily the ones with the best traditional SEO. They’re the ones with the most genuine, voluminous, conversational human content. If your brand isn’t represented in those spaces, you risk being invisible to AI-powered discovery and increasingly, to your audience.
Frequently Asked Questions ?
What domain is cited most by LLMs in 2026?
According to Semrush data from January 2026, Reddit.com is the most cited domain by large language models, accounting for 11.29% of all citations — narrowly ahead of LinkedIn.com at 11.03%.
Why does Reddit rank higher than Wikipedia for LLM citations?
Reddit’s conversational, experience-driven content aligns well with how people phrase questions to AI assistants. LLMs are trained to generate natural, helpful responses — and Reddit’s threads provide rich, opinionated, human language that maps onto this well.
What is Generative Engine Optimization (GEO)?
Generative Engine Optimization (GEO) is the practice of creating and distributing content specifically to be cited or referenced by AI language models like ChatGPT, Claude, or Gemini — as opposed to traditional SEO which targets search engine rankings.
How can I get my content cited by LLMs?
Focus on publishing authoritative, conversational, and well-structured content on platforms that LLMs heavily index: Reddit, LinkedIn, Medium, YouTube, and Quora. Use question-and-answer formats, cite credible sources, and write in clear, natural language.
