I apologise in advance for the sarcastic tone (I could not help myself): If you can run Facebook at Facebook's scale with no more than a dozen servers, I'm going to hire you for my next project because man, that would be something! I suggest you send a CV to Google because they are running an even bigger scale than Facebook and if you can dilute them to say 100 servers - its a win! Facebook's infra is unique. If it was built today it might have been different but it would still run on MANY servers across MANY geographical locations. It would still cost millions to run every month. This is why companies like Google are building data centres. Its cheaper for them in the long run to own the infra from the ground up, literally (i.e., owning the actual land the DC is on).