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The fix is probably 10 minutes but the deployment process, intake process and notification process took 3 1/2 hours

Is there an article or blog post somewhere about what Facebook's deployment process is like? It must be a massive operation.

They also use bittorrent:

What about code review process? Surely someone else verified the fix before deployment.

FB uses Phabricator, which was spun out into an open-source project: