Web content filtering question

Greetings,

Does anyone know of a solution that can block inappropriate (adult) content being served by a site that is not classified as such? For example, Twitter hosts XXX content which users can access because our solution (Cisco Umbrella) does not have that domain classified as an adult site. Category blocking only works at the domain level based on how the site is classified. Obviously the site I mentioned can be blocked entirely, but I would prefer to find a …

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