Nothing to do with scuba, and if you did any operational work you'd know that it's in the category of tools that are often flaky due to lack of QA. It's also worth noting that the link you provide only shows 41 listings, and most of those merely mention "familiarity with QA" in some boilerplate for what's obviously a developer position. Leet reading skills you have there. Percentage-wise, there are fewer true QA positions there than we have E-10s. For a company that hires 10K a year, that's indistinguishable from zero.
> AR/VR, Oculus, portal and workplace
In other words some small percentage of the company, none of it near me. All of the systems that the profitable parts of Facebook rely on - to provision systems, monitor systems, store data, move data around, analyze data, etc. - rely entirely on developer testing. So here's an amended statement to make you happy.
"99.9% of Facebook has no QA, and the rest has really bad QA."