They managed with 7,000 in 2013. But a lot of things changed. To continue to grow they needed to buy Facebook and Instagram. They scaled up their infrastructur

They managed with 7,000 in 2013. But a lot of things changed. To continue to grow they needed to buy Facebook and Instagram. They scaled up their infrastructure - lots of system administrators. They needed more sales people and corporate campaign managers to get advertising in. More moderation, because governments started passing internet content laws. Spam detection. Customer support. Automated content blocking. More legal teams, because they are constantly under legal attack. Don't forget all these laws and what is acceptable or not changes by country - so they need a team in every country to handle that. Then there's VR, Meta AI, the 'Metaverse', and their whole R&D division.