Stack Overflow is probably getting 90% of their page views through Google SERPs. That means nearly every request is a single answers page from a non-logged in u

Stack Overflow is probably getting 90% of their page views through Google SERPs. That means nearly every request is a single answers page from a non-logged in user. Stack Overflow could write out static HTML files for 90% of their traffic. That would let them scale to >500M page views on one server. Digg on the other hand is generating highly dynamic pages on a per-user basis for a lot of their traffic. That's inherently more resource intensive. That said, Digg clearly wasted a ton of money on servers. They pretty much had to. The only way to spend $40 million is to over hire and over build your datacenter.