Simon Willison’s Weblog

25th November 2007 - Link Blog

Deconstructing Facebook Beacon JavaScript. How Facebook’s new Beacon service (also known as “Facebook ruined Christmas”) actually works.

Posted 25th November 2007 at 9:20 pm

Recent articles

My fireside chat about agentic engineering at the Pragmatic Summit - 14th March 2026
Perhaps not Boring Technology after all - 9th March 2026
Can coding agents relicense open source through a “clean room” implementation of code? - 5th March 2026

This is a link post by Simon Willison, posted on 25th November 2007.

beacon 1 facebook 117 javascript 745 privacy 65

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