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> But how do you verify Facebook? Facebook computes what?

You start by verifying the permissions structure for Facebook posts.

And by verifying the shortest, least complex functions in Facebook's server side code base.

The final proof you get from formal methods is often irrelevant in my opinion. Most of the benefit comes from architecting the system so as much as possible can be verified and forcing yourself to make intentional decisions on the edge cases. The results are for other people.

I'm not sure you want to create a record of intentional decisions if you're at Facebook though.

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