Intimate Merger Inc. uses Elasticsearch as a data management platform (DMP) to centrally manage and analyze 360 million user IDs from various sources like partner media, surveys, and access logs. Elasticsearch allows them to easily extract user IDs that match complex conditions and analyze audience groups. For example, they can target ads to females aged 20-29 in Tokyo interested in Hawaii trips. Elasticsearch also facilitates comparing audience groups and identifying key characteristics. The document provides examples of how Intimate Merger uses Elasticsearch for ad targeting and audience analysis.