A few days ago, an article was posted how WhatsApp has scaled to nearly a billion users and is still running with only 50 engineers. Isn't running 4chan more impressive feat being run, if I am not wrong, by just one engineer, and that too from a time when web development tools weren't anywhere close to what we have today.
It's impressive in the sense that the staff size is in the order of magnitude you would expect given their publicly-visible product. Many companies will brag about their ops staff being big (because they're so great that their system has to scale) or small (because they're so great at building scalable systems), but operate so opaquely you have zero way to judge the impressiveness of the number and you have to trust the opinion of a journalist that doesn't even care to know.