> ## Documentation Index
> Fetch the complete documentation index at: https://docs.peec.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Most-cited domains in AI search — Reddit, YouTube, LinkedIn lead

> Peec's 30-million-source analysis (Mar 2026, US) ranks the top 10 domains cited across ChatGPT, Google AI Mode, Gemini, Perplexity and AI Overviews: Reddit #1, YouTube #2, LinkedIn #3, Wikipedia #4.

Reddit is the most-cited domain in AI search. Peec analyzed 30 million cited sources across ChatGPT, Google AI Mode, Gemini, Perplexity, and AI Overviews in the US ([full study](https://peec.ai/blog/top-domains-cited-by-ai-search-analysis-based-on-30m-sources), Mar 2026), counting only sources directly cited in answers.

Top 10 most-cited domains (Mar 2026):

1. Reddit.com
2. YouTube.com
3. LinkedIn.com
4. Wikipedia.org
5. Forbes.com
6. G2.com
7. Yelp.com
8. Facebook.com
9. Medium.com
10. Techradar.com

The generic list is a starting point, not a strategy: industries have their own dominant sources (in hotels, Booking.com and Airbnb often outrank Reddit). Per-platform rankings differ meaningfully — see [Most-cited domains by engine](/research/most-cited-domains-by-engine) — and individual platforms have their own dynamics: [Reddit in AI search](/research/reddit-in-ai-search), [YouTube in AI search](/research/youtube-in-ai-search), [Wikipedia in AI search](/research/wikipedia-in-ai-search), [Review sites in AI search](/research/review-sites-in-ai-search).

**Source:** [Top domains cited by AI search: Analysis based on 30M sources](https://peec.ai/blog/top-domains-cited-by-ai-search-analysis-based-on-30m-sources), Peec (Tomek Rudzki), Mar 2026.