This document discusses how big data analytics and behavioral science can be used for micro-targeted advertising on social media. It explains that advertisers can now target thousands of micro segments based on psychographics like personality traits, rather than just demographics. Data from social media likes and activities can reveal people's personalities, and combined with other data sources in a data management platform, allows creating highly personalized ad variants for micro segments. Companies like Cambridge Analytica have developed personality prediction models to enable this kind of micro-targeted messaging at scale.