Redesigning our systems to provide more control over Off-Facebook activity

What this post added

This post details the technical redesign of Meta's systems to provide users with control over Off-Facebook activity. It describes the challenges of storing and processing this data, which was primarily in the data warehouse, and the need to move away from time-based partitioning to user-centric organization for this specific feature. Key technical solutions include the introduction of Separable Identifiers (SIDs) to decouple user IDs (UIDs) from off-site activity data in the data warehouse, the use of Encrypted IDs (EIDs) for compound data types, and Measurement IDs (MIDs) to enable aggregated measurement reporting while respecting user privacy. The post also outlines strategies for handling special cases, such as ensuring data security and safety investigations, and managing Facebook Login integrations.