This document discusses optimizing user engagement on Facebook by leveraging user attributes and predictive algorithms. It introduces predictive best-fit optimization as an automated solution that can optimize in-app and open graph performance in real-time using various user data sources. This approach aims to provide insights and maximize key performance indicators like revenue, virality, and retention without the effort and limitations of traditional techniques like A/B testing and segmentation. The document also provides examples of how open graph optimizations around elements like publishing, creative, and timing increased user engagement for various games and apps.