A blog post last month touched on this: "Q: Why is reddit tied so tightly to the affected availability zone? A: When we started with Amazon, our code was writt

A blog post last month touched on this: "Q: Why is reddit tied so tightly to the affected availability zone? A: When we started with Amazon, our code was written with the assumption that there would be one data center. We have been working towards fixing this since we moved two years ago. Unfortunately, progress has been slow in this area. Luckily, we are currently in a hiring round which will increase the technical staff by 200% :) These new programmers will help us address this issue." Not sure if the costs of data transfer between regions (charged at full internet price) would justify the added reliability/lower latency though.