{
  "kind": "fact",
  "studySlug": "citation-sources",
  "slug": "the-citation-graph-spans-more-than-two-hundred-thousand-domains",
  "title": "The citation graph spans more than 200,000 domains",
  "description": "The long tail is enormous even when the head is concentrated.",
  "lastUpdated": "2026-04-17",
  "lastTested": "2026-04-17",
  "sourceStudyUrl": "/trakkr-research/citation-sources",
  "sourceStudyTitle": "Where AI Gets Its Answers",
  "claimIds": [
    "citation-sources:unique-domains",
    "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",
    "tracker:top-cited-domain-tracker"
  ],
  "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": "Article",
    "includeDataset": true
  },
  "claim": "The current Trakkr citation index spans 208,567 unique domains.",
  "supportingMetrics": [
    {
      "label": "Unique domains",
      "value": "208,567",
      "detail": "The citation surface is broad even though a small set dominates."
    },
    {
      "label": "Brands analyzed",
      "value": "1,038",
      "detail": "Brand coverage in the latest live corpus."
    }
  ],
  "whyItMatters": "Brands do not only compete with category leaders. They compete with an extremely fragmented evidence layer.",
  "citationBlock": {
    "quote": "The current Trakkr citation index spans 208,567 unique domains.",
    "attribution": "Where AI Gets Its Answers - Trakkr Research",
    "url": "https://trakkr.ai/trakkr-research/citation-sources/facts/the-citation-graph-spans-more-than-two-hundred-thousand-domains"
  }
}