That's interesting. I remember having to defend my using ruby to other programmers around that time. I always loved it, and all the hate seemed to be centered around "it's too slow". No one ever brought up twitter being down, explicitly, that I can recall. Perhaps that's what they had in the back of their mind though? It's been a bit of a mystery to me why people passionately hate on ruby and IMO dismiss it out of hand. It's so nice to program with.
Twitter started with rails and constantly went down. Rails was blamed for the downtime, perhaps unfairly.