Ghost Citation

What is a ghost citation?

A ghost citation is an appearance where an AI answer links a page as a source but never writes the brand's name into the answer text. Users read the answer without ever seeing who it came from. Kevin Indig coined the term, and a joint study with Semrush (June 2026, 3,981 domain appearances across four AI engines) quantified it for the first time: 61.7% of all appearances were ghost citations.

Why the distinction matters

Citations and mentions happen independently. In the same study, only 13.2% of appearances included both a citation and a mention, and the citation rate (74.9%) was roughly double the mention rate (38.3%). A report that says "AI is citing our site" does not guarantee that users see the brand in answers. Collapsing the two metrics into one visibility number makes ghost citations invisible.

Per-engine patterns

Engines behave in opposite ways. ChatGPT is citation-driven (87% cited, 20.7% mentioned) while Gemini is mention-driven (83.7% mentioned, 21.4% cited). For the same prompts, the brands the two engines surfaced barely overlapped — visibility in one engine cannot be inferred from the other.

Measurement takeaways

• Site type decides the primary metric — publishers and informational sites should track citations first; consumer brands and SaaS should track mentions first.
• Comparative content earns mentions — in the study, comparative content produced 2.4x more brand mentions than informational content.
• Measure citations and mentions separately — track answer-text mentions and source citations per engine; the ghost-citation ratio only becomes visible when the two are split.

Related terms

• Citation Share
• Brand Mention Share
• AI Visibility Diagnosis
• Generative Engine Optimization (GEO)
• Answer Engine Optimization (AEO)

Read more

• Ghost Citations: Why 62% of AI Citations Never Mention Your Brand — the full study figures and per-engine strategy