Citation behavior varies widely by content type. An Ahrefs study of 1.4 million ChatGPT prompts found that roughly half of the URLs an answer engine retrieved were actually cited in the response, and that search-sourced content was cited 88.5% of the time compared with just 1.9% for Reddit-sourced content, showing that where a source comes from strongly shapes whether it gets cited at all.
For a brand, citation share highlights whether its own pages are earning direct links inside AI answers or whether visibility is coming secondhand through press coverage, review sites, or forum discussions that mention the brand without citing it. A brand can have strong mention rate but weak citation share, which usually points to content that needs to be more retrievable, current, or structured for machine parsing.