During a recent study, I discovered that Reddit stands out as the most-cited domain in AI-generated answers. In fact, it’s ahead of heavyweights like YouTube and LinkedIn, thanks to an analysis of 30 million sources conducted by Peec AI, a tool specializing in AI search analytics.
The findings: I’ve learned that Reddit claims the top spot across various AI platforms including ChatGPT, Google AI Mode, Gemini, Perplexity, and AI Overviews. Top contenders YouTube, LinkedIn, Wikipedia, and Forbes are right behind. Platforms like Yelp and G2 frequently appear when searching for recommendations.
As I delved deeper into the research, it became clear which domains the AI models tend to lean on:
- ChatGPT values Wikipedia, Reddit, and editorial sites like Forbes.
- Google shows preference for platforms such as Facebook and Yelp.
- Perplexity favors Reddit, LinkedIn, and G2 for queries within the B2B realm.
Why we care: The insight that resonated with me was the importance of having authority beyond just our own websites. Brands that consistently feature on reputable third-party platforms have a better chance of being cited by AI.
Why these sources? It’s fascinating to see how AI systems are wired to prioritize both authority and authentic user input:
- I’ve found that Reddit excels because it mirrors genuine user discussions.
- YouTube shines in video citations, owing to their comprehensive transcripts and descriptions.
- Wikipedia not only serves real-time data but also acts as a foundation for training datasets.
About the data: The analysis spanned 30 million sources, providing a comprehensive look at how often domains are directly cited in AI answers, effectively revealing what shapes these responses.
The study. For those interested in a deep dive, the full study is available here: Top domains cited by AI search: Analysis based on 30M sources
Dig deeper. For more on citation research, check out these fascinating reads:
- AI citations favor listicles, articles, product pages (March 2026)
- Only 15% of pages retrieved by ChatGPT appear in final answers (March 2026)
- ChatGPT citations favor a small group of domains (March 2026)
- Google’s AI Mode is citing Google more than any other site (March 2026)
- 44% of ChatGPT citations come from the first third of content (February 2026)
- AI Overview fan-out rankings boost citation odds by 161% (December 2025)
- Tracking AI search citations: Who’s winning across 11 industries (October 2025)
- YouTube dominates AI search with 200x citation advantage (October 2025)
- AI search relies on brand-controlled sources, not Reddit (October 2025)
- How to get cited by AI: SEO insights from 8,000 AI citations (May 2025)
- 82% of Google AI Overviews citations come from deep pages (March 2025)
Inspired by this post on Search Engine Land.
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