You're greatly underestimating the complexity of Facebook. I bet they have greater than 200,000 machines. Creating the infrastructure to just manage and deploy

You're greatly underestimating the complexity of Facebook. I bet they have greater than 200,000 machines. Creating the infrastructure to just manage and deploy to those machines would already go beyond your 'small team'. Not sure how you imagine a 'small team' managing a system that has an exabyte of data. From network infrastructure all the way down to cold storage, a 'small team' would be needed for each.