2025-06-04
tldr: FB/IG app ran a local socket on their Android app, and their web tracking pixels used it to report back. — This didn't just get built out of nowhere. Lots of people at Meta probably wrote a PRD, eng design docs, and sat in meetings to discuss developing this tracking method.
Ars Technica
Researchers detail a technique Meta and Yandex use to glean some logged-in Android users' browsing histories from Chromium-based browsers via web identifiers
even in incognito mode or with a VPN Nick Heer / Pixel Envy : Meta and Yandex Apps on Android Have Been Tracking Users in Newly Creepy Ways Bluesky: Matthew Green / @matthewdgreen ...