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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, 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 — and individual platforms have their own dynamics: Reddit in AI search, YouTube in AI search, Wikipedia in AI search, Review sites in AI search. Source: Top domains cited by AI search: Analysis based on 30M sources, Peec (Tomek Rudzki), Mar 2026.