MQTT-derived transport
Custom binary MQTT variant. Persistent connection per client. Efficient for mobile — lower battery than raw TCP+JSON.
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MQTT-derived transport
Custom binary MQTT variant. Persistent connection per client. Efficient for mobile — lower battery than raw TCP+JSON.
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TAO for social graph
Same TAO that powers Facebook. Millions of QPS. Aggressive cache. Powers 'who can I message' + read receipts.
Sharded MySQL for messages
Shard by thread_id. Retention policies + indexes tuned for recency queries. Older messages tiered to colder storage.
E2E rollout via Labyrinth
Meta's Signal-Protocol-derived encryption. Being made default in 2024/25. Historic messages not E2E — encrypted at rest server-side.
Cross-Meta unified inbox
Instagram DM + Messenger converging. Same account, unified inbox planned. Federated identity across Meta properties.