Engineering @ Facebook: Facebook Chat. The new Facebook Chat uses Comet (long polling with a hidden iframe) against a custom web / chat server written in Erlang, designed to handle a launch to all 70 million users at once. It was tested using a “dark launch” period where live pages simulated chat request traffic without showing any visible UI.
Recent articles
- A new SQL-powered permissions system in Datasette 1.0a20 - 4th November 2025
- New prompt injection papers: Agents Rule of Two and The Attacker Moves Second - 2nd November 2025
- Hacking the WiFi-enabled color screen GitHub Universe conference badge - 28th October 2025