On the Twitter Engineering Blog, Ben made a visual representation of their development work:
As a fun way to kick things off, I ran Code Swarm over a few essential production apps. Icons represent developers, and particles represent files added or modified. It doesn’t cover prototypes or contributions to open source, so it isn’t exactly scientific, but it still goes to show Twitter’s explosive growth mirrored in engineering.
Delicious
Dopplr
Facebook
Flickr
Last.fm
Twitter
Vimeo