How many were they at YouTube when they got bought? I tend to think more about acquisitions as capital per employee, as in, that's how efficient they are at cr

How many were they at YouTube when they got bought? I tend to think more about acquisitions as capital per employee, as in, that's how efficient they are at creating value. It's more interesting that comparing users because of the "users doing what" question. I'm disappointed i can't find graphs about those. Last companies I checked (but I can't remember which ones), the capital was around $1m per employee. Except for WhatsApp.