HOW META ENFORCES PURPOSE LIMITATION VIA PRIVACY AWARE INFRASTRUCTURE AT SCALE

Summary from the TLDR Web Dev newsletter

Meta's Privacy Aware Infrastructure (PAI) is a large-scale initiative designed to enforce purpose limitation. PAI's key component, Policy Zones, provides a comprehensive mechanism for encapsulating, evaluating, and propagating privacy constraints for data in transit and at rest. Its integration across various Meta systems, including function-based and batch-processing systems, makes sure that data is only used for its intended purpose.