Stack Overflow is a read heavy website. They can get away with caching most of their requests in POPs around the world which will deal with the vast majority of

Stack Overflow is a read heavy website. They can get away with caching most of their requests in POPs around the world which will deal with the vast majority of traffic. Having thousands of users is a meaningless metric for web operations. Are those concurrent users? Are those read/write heavy users? Are those mixed usage users? There are a lot of qualifiers that need to be attached to that question to allow any meaningful discourse.