> Also, how is it that large enterprises like Google, Facebook, Twitter, Amazon, etc. can scale to millions/billions of users using a similar API-driven approac

> Also, how is it that large enterprises like Google, Facebook, Twitter, Amazon, etc. can scale to millions/billions of users using a similar API-driven approach and a company of tens of thousands couldn't do the same thing for their ERP system that probably has < 100,000 users on it? Business rules. Google clientel basically all use the same api to ask the same question. SAP users have, I'm guessing, 2 -3 orders of magnitude more differences and rules that a google user does. This is a 100 billion dollar business where almost every company on the face of the earth can be a client so it attracts some very smart people. The huge differences from company to company make it really tough to have one product scale out for everyone. SAP, Oracle, SalesForce, Microsoft and many others have tried and the fact that no one has done it yet speaks to how difficult it is to do.