CaptainTaboo | 3 years ago | on: Facebook engineers: we have no idea where we keep all your personal data
It's not just the tech giants. I work for a company that is fairly dominant in its particular industry (If you're in the US, you've probably done business with one of its customers). Much of our growth has come through the acquisition of other companies, each of which gathers its own user and customer data.
From my perspective in IT operations, I don't have any visibility into how we capture user and customer data, but I know we're big enough to track a user across the various products and websites, but still siloed enough that internally we still refer to the various business units as if they were separate organizations, each holding its own subset of the data. To sum up, this description of Facebook's internals doesn't surprise me at all.