{
  "kind": "tracker",
  "studySlug": "citation-sources",
  "slug": "top-cited-domain-tracker",
  "title": "Top cited domains in the live index",
  "description": "Current head domains in Trakkr’s live public citation graph.",
  "lastUpdated": "2026-04-17",
  "lastTested": "2026-04-17",
  "sourceStudyUrl": "/trakkr-research/citation-sources",
  "sourceStudyTitle": "Where AI Gets Its Answers",
  "claimIds": [
    "citation-sources:wikipedia-share",
    "citation-sources:unique-urls",
    "citation-sources:brands-analyzed"
  ],
  "relatedSlugs": [
    "answer:how-concentrated-is-the-ai-citation-landscape",
    "answer:does-ai-rely-more-on-reference-sites-than-the-open-web",
    "fact:the-citation-graph-spans-more-than-two-hundred-thousand-domains"
  ],
  "methodologySummary": "Built from the live citation index backing Trakkr Research, using 8,777,687 citations across 208,567 unique domains observed between October 3, 2025 and April 17, 2026.",
  "limitations": [
    "The live citation index is broader than the original December 2025 launch study, so percentages here should be read as the current benchmark.",
    "Domain share does not mean causal influence. It measures what models cited, not the full retrieval set.",
    "Category totals are domain-level rollups and may hide differences by model or query intent."
  ],
  "keywords": [
    "AI citations",
    "citation sources",
    "AI source preferences",
    "domain authority in AI"
  ],
  "schemaHints": {
    "pageType": "WebPage",
    "includeDataset": true,
    "includeItemList": true,
    "itemListName": "Top cited domains in the live index"
  },
  "summary": "The head of the citation graph is dominated by cross-category authorities such as Wikipedia, YouTube, Reddit, and major editorial or review sites.",
  "keyFacts": [
    {
      "label": "Wikipedia share",
      "value": "6.43%",
      "detail": "en.wikipedia.org alone accounts for 564,191 citations.",
      "claimId": "citation-sources:wikipedia-share"
    },
    {
      "label": "Unique cited URLs",
      "value": "744,579",
      "detail": "AI systems repeatedly converge on a relatively small URL set.",
      "claimId": "citation-sources:unique-urls"
    },
    {
      "label": "Brands analyzed",
      "value": "1,038",
      "detail": "Brand coverage in the latest live corpus.",
      "claimId": "citation-sources:brands-analyzed"
    }
  ],
  "benchmarkRows": [
    {
      "label": "Wikipedia share",
      "value": "6.43%",
      "note": "en.wikipedia.org alone accounts for 564,191 citations."
    },
    {
      "label": "Citations analyzed",
      "value": "8.78M",
      "note": "Current live citation index as of April 17, 2026."
    },
    {
      "label": "Unique domains",
      "value": "208,567",
      "note": "The citation surface is broad even though a small set dominates."
    }
  ],
  "rankedItems": [
    {
      "name": "en.wikipedia.org",
      "value": "6.43%",
      "detail": "The current top cited domain in the public citation index."
    },
    {
      "name": "youtube.com",
      "value": "2.10%",
      "detail": "The leading creator platform in the citation layer."
    },
    {
      "name": "reddit.com",
      "value": "0.79%",
      "detail": "Strong community evidence source, especially for opinionated queries."
    },
    {
      "name": "techradar.com",
      "value": "0.48%",
      "detail": "A recurring editorial tech source."
    },
    {
      "name": "forbes.com",
      "value": "0.48%",
      "detail": "A large editorial business source with broad category reach."
    }
  ],
  "changes": [
    {
      "title": "Cross-category authorities still dominate",
      "detail": "The head domains are broad platforms with dense content and strong reuse across industries."
    },
    {
      "title": "Commercial source types still show up lower in the head",
      "detail": "Review and editorial domains matter most where the model needs evaluation or product judgment."
    }
  ]
}