Earlier quoted context omitted.
For comparison, Facebook had 3500 employees at the time of their IPO, and it's "just a website." Snapchat is many products: video ad platform, augmented reality selfie app, broadcast platform via sunglasses, photo uploading app, and messaging app.
do we really want to get into this discussion? whatsapp had what Facebook had ÷ 100.
And by their own admission, they intentionally tried to slow user growth.