This disclosure describes techniques to measure authority content gap (ACG), which represents the (lack of) authoritativeness in online content related to individual topics. The ACG metric is defined for various verticals, e.g., health, government services, legal, etc., and can be specific to region, country, language, or time period. The ACG is refreshed periodically, and it can be used in combination with other metrics relating to a content publisher. The ACG is a useful measure in various contexts, e.g., when an unpopular or obscure topic achieves sudden popularity, or when a new topic emerges. The ACG for a topic can indicate when authoritative content about such topics is unavailable and can be utilized to ameliorate the situation, e.g., by alerting content providers about the content gap.

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