I don’t mean this in a way that suggests Facebook is culturally important and good in any fashion, but Facebook does a LOT of different things and in fact is a multitude of websites and features in a trench coat. Whether they are bloated with employees or not, it makes perfect sense for Facebook to have a metric ton of employees. Also it’s not just Facebook, it’s Meta as a company so there are plenty of people working there who have nothing to do with the website.