Reddit ranks as the most-cited domain in AI-generated answers, followed by YouTube and LinkedIn, based on a new analysis of 30 million sources by Peec AI, an AI search analytics tool.
The findings. Reddit was the most-cited source across ChatGPT, Google AI Mode, Gemini, Perplexity, and AI Overviews. YouTube, LinkedIn, Wikipedia, and Forbes also ranked in the top five. Review platforms like Yelp and G2 appeared often in recommendation queries.
The research showed which domains models rely on:
- ChatGPT favored Wikipedia, Reddit, and editorial sites like Forbes.
- Google leaned toward platforms like Facebook and Yelp.
- Perplexity emphasized Reddit, LinkedIn, and G2 for B2B queries.
Why we care. To win in AI search, you need authority beyond your site. Brands that appear consistently across trusted third-party platforms are more likely to be cited.
Why these sources? AI systems prioritize perceived authority plus authentic user input:
- Reddit leads because it captures real user discussions.
- YouTube dominates video citations via transcripts and descriptions.
- Wikipedia serves as both a live source and a training dataset.
About the data. The analysis covered 30 million sources across ChatGPT, Google AI Mode, Gemini, Perplexity, and AI Overviews, measuring domains directly cited in answers to isolate what shapes responses.
The study. Top domains cited by AI search: Analysis based on 30M sources
Dig deeper. More citation research:
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