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Source affinity is the observed preference of a specific AI platform for certain types or categories of sources when generating answers. Each platform has different affinities: Perplexity favors editorial publications and structured reference sites; ChatGPT draws from a broader mix including forums and brand-owned content via Bing; Gemini favors Google-indexed high-authority domains.

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Why it matters

Understanding source affinities helps brands prioritize where to invest in content and PR for each platform. If Perplexity consistently cites tier-1 editorial publications for your category but rarely cites brand-owned sites, the highest-leverage optimization for Perplexity visibility is earning editorial coverage — not improving your own blog. If ChatGPT draws from a broader source mix, investing in owned content may be more effective.

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How it applies in practice

Cited’s source preference hierarchy documents the general pattern (editorial > reference > industry-specific > brand-owned > aggregators), but individual platform affinities vary from this general ranking. Cited’s dashboard citation source data shows which specific publications each platform cites for a brand’s category queries, enabling platform-specific PR targeting.