Simon Willison’s Weblog

28th June 2009 - Link Blog

Twitter, an Evolving Architecture. The most detailed write-up of Twitter’s current architecture I’ve seen, explaining the four layers of cache (all memcached) used by the Twitter API.

Posted 28th June 2009 at 3:09 pm

Recent articles

2026 in LLMs (so far) - 27th September 2026
Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war - 22nd September 2026
Jev introduces a new shape of LLM - System One, aka Decision Models - 21st September 2026

This is a link post by Simon Willison, posted on 28th June 2009.

caching 49 memcached 33 twitter 161 software-architecture 25

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe