Every two or three months, I check to see if there have been new write-ups on the architecture of big sites, or otherwise interesting budget scaling examples (think: plenty of fish, Etsy, or Stack Exchange). Maybe once or twice per year I find myself looking up something I read there previously on an architecture.
I look at it from time to time... haven't seen anything good on there in a while though.
For reference only. Once in a while, I'd need to check the architecture from big guys like YouTube, StackOverflow..