There are a couple of things: 1. The servers aren't all application servers. There's load balancers, memcache servers, lossy memcache servers, etc. 2. It's t

There are a couple of things: 1. The servers aren't all application servers. There's load balancers, memcache servers, lossy memcache servers, etc. 2. It's the cloud. It includes large instances, HA-Proxies, memcache servers, etc. 3. There's very high write characteristics for social gaming's data store, but the read is similar to normal web application. 4. He took an aggregate server #, and generalized it over a period of 30 weeks. It's directionally accurate, but I wouldn't take it literally.