tl;dr
summary please
assigns a unique identifier (or RUID) to any user exposed to an advertising message, whatever the delivery medium – website, emailing, or social media. Just like a genetic marker, the RUID not only enables the identification of new fans for a given brand or advertiser in the same way classic recruitment does, but it also tracks their value over time.
I'm surprised no one asked OP to show tits. Y'all shy cuz she's French??