This document discusses how personalization, user data, and search can be used for behavioral targeting and personalization in search engine marketing. It provides examples of how targeting based on language, source, keyword match type, temporal factors, geo location, and affinities can increase user engagement and conversion rates. Specific examples show lifts in click-through rate, conversion rate, and revenue per visitor from personalizing search results. The document advocates for using data to discover user segments and affinities in order to personalize and target digital marketing efforts.