A concern of online ad networks is the suitability of an advertisement to particular viewers, e.g., ensuring that ads are age-appropriate. Age gates, in which a user self-declares age, can be easily fooled. This disclosure describes ads that attempt to verify age by requesting that the user to respond to questions, the answers to which are typically known only to someone that meets a particular threshold age or is in a specific age range.
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Dukellis, John Nicholas and Butcher, Derek, "Ads that verify user age", Technical Disclosure Commons, (September 06, 2019)