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This is a note published by Facebook Engineering that discusses their graph database system called TAO. TAO stands for "The Associations and Objects" and it is designed to efficiently store and retrieve the vast amount of social graph data that Facebook handles. The note provides an overview of TAO's architecture, highlighting its key components and how it integrates with other Facebook systems. It also explains how TAO handles consistency and scalability challenges to ensure fast and reliable data access. Overall, the note showcases the power and importance of TAO in managing and serving Facebook's social graph.