no no, not in the fb app, in the mobile browser: https://news.ycombinator.com/item?id=44169115

TBF it's "only" sites with a meta pixel, and on Android. But in my book this does not matter, it shows their intentions

Ohhh yes I remember that one. Diabolically clever.

I'm sure there's also no user-controlled firewall to stop it on Android either.