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

# Citation Concentration

> Citation concentration is the pattern by which a small number of highly-cited domains account for a disproportionate share of citations on a given platform.

*Core concept* · *Citation & Visibility Measurement*

## Definition

Citation concentration is the pattern by which a small number of highly-cited domains account for a disproportionate share of citations on a given platform. Wikipedia accounts for 7.8% of all ChatGPT citations. YouTube leads Google AI Overviews at approximately 10%. Only 14% of the top 50 cited sources are shared across ChatGPT, Perplexity, and Google AI Overviews.

## Why It Matters for AI Search

Citation concentration has two implications. First, the platforms do not share a citation footprint — optimizing for one does not transfer to the others. Second, the dominant cited domains on each platform are structurally embedded in ways that reflect the platform's underlying index and parametric layer. Brands cannot displace these; they can only compete within the long tail.

## Related Terms

<CardGroup cols={2}>
  <Card title="Brand citation rate" href="/ai-search-glossary/brand-citation-rate" />

  <Card title="Prompt visibility" href="/ai-search-glossary/prompt-visibility" />

  <Card title="Citation footprint" href="/ai-search-glossary/citation-footprint" />

  <Card title="Wikipedia presence" href="/ai-search-glossary/wikipedia-presence" />

  <Card title="Domain Authority" href="/ai-search-glossary/domain-authority" />
</CardGroup>

## Relevant Plate Lunch Collective Services

[AI Search Visibility Assessment](https://www.platelunchcollective.com/services/context-map)  [Context Map](https://www.platelunchcollective.com/services/context-map)