Always interested in claims like this. I'm not remotely trying to falsify or even challenge the claim, but given modern times, a lot of what Facebook has built

Always interested in claims like this. I'm not remotely trying to falsify or even challenge the claim, but given modern times, a lot of what Facebook has built has now been offloaded to open source packages, some of which have sprung up startups in the "${x} as a service" mold, meaning that those measurements on things like "headcount" get fuzzier. I'm confident that I could build a social network that scales with a 3 person team. In fact, I've done it before, but it relied on hosting and data providers and frontend frameworks and languages that I definitely could not have developed the entirety of as a 2-person team. Do those factor into the count, or are we in the "if you do everything yourself, a cup of coffee actually costs $300,000?" At what point does labor specialization come into play? Because there's the guy who does everything "from scratch" and realizes exorbitant costs for small things, and on the other end of the spectrum is the guy who started a profitable coffee company with $1800 of seed capital, down to the practical reality of the median cup of drip coffee, brewed at home, costs approximately $0.30.