Which sources dominate AI citations? | Trakkr Research
YouTube leads the current Trakkr index with 3.47% of citation appearances, followed by English Wikipedia at 1.83% and Reddit at 1.74%. Together, the top three account for 7.04%.
Methodology: Built from 48,422,016 citation appearances across 529,165 unique domains in the latest valid snapshot for 1,643 tracked brands, observed from October 3, 2025 to August 18, 2026.
Direct Answer
YouTube leads the current Trakkr index with 3.47% of citation appearances, followed by English Wikipedia at 1.83% and Reddit at 1.74%. Together, the top three account for 7.04%.
What this means
This answer matters because it turns a study finding into an operating rule teams can use when they decide what to publish, refresh, or measure next.
Evidence table
| Metric | Value | Why it matters |
|---|---|---|
| YouTube share | 3.47% | youtube.com ranks first with 1,680,655 citation appearances. |
| Wikipedia share | 1.83% | en.wikipedia.org ranks second with 886,607 appearances. |
| Top three domain share | 7.04% | YouTube, English Wikipedia, and Reddit together account for 7.04%. |
| Citation appearances | 48.4M | 48,422,016 appearances in the verified August 18, 2026 snapshot. |
Frequently Asked Questions
Which sources dominate AI citations?
YouTube leads the current Trakkr index with 3.47% of citation appearances, followed by English Wikipedia at 1.83% and Reddit at 1.74%. Together, the top three account for 7.04%.
Which numbers from AI Citation Index matter most here?
YouTube share: 3.47%. youtube.com ranks first with 1,680,655 citation appearances. Wikipedia share: 1.83%. en.wikipedia.org ranks second with 886,607 appearances.
What should a team do next?
Audit the domains that already dominate your category and decide which ones are realistic citation targets. Build source-worthy pages for the query shapes where AI is already citing third parties. Treat reference, review, and social sources as part of your AI visibility surface, not as noise.
What to do next
Related pages
Continue through the same study cluster.
- how concentrated is the ai citation landscape - Related answer page
- does ai rely more on reference sites than the open web - Related answer page
- wikipedia leads the current citation index - Related fact page
- source category share tracker - Related tracker page
Data & Sources
- AI Citation Index - Flagship study behind this page
- Page JSON - Machine-readable companion file