[rdouble]

I was surprised they had so few... I once worked on a site with 1/6th the users and 3.5 times the number of instances.

They could do better but they'd have to manage their own datacenter and write portions of the app in C++. It's probably not worth it at this point unless they hire someone with that specific expertise.

[jphackworth]

I once worked on a site with 1/6th the users and only one machine. ;-) Counting users often doesn't match across sites, especially when an Instagram user is someone who has downloaded the app, and might never come back. That's why the 50 photo uploads per second peak is a useful benchmark.

[mikeyk]

Hey, author here. To clarify, our uploads go to our servers first (where we resize for thumbnails, etc) then go to S3.

[WALoeIII]

Do you use GraphicsMagick or ImageMagick? Shell out or python bindings?

What settings do you use for: MAGICK_MEMORY_LIMIT MAGICK_MAP_LIMIT MAGICK_DISK_LIMIT

Do you tune them dynamically or just set and forget?

[scottostler]

I'm curious about this as well.

[palish]

Offtopic: Would you consider letting a hacker work for you remotely?