Ask HN: So what happened to Facebook "localhost" tracking?

27 pointsposted 2 hours ago
by juliusceasar

Item id: 48397731

22 Comments

applfanboysbgon

an hour ago

> Meta must face a lawsuit alleging that it secretly tracked Android users' browsing activity on mobile websites that embedded Meta's analytics pixel, and linked that activity to users' identities, a federal judge ruled Monday.

> The decision, issued by U.S. District Court Judge Rita Lin in San Francisco, grew out of a class-action complaint initially brought last June by California resident Devin Rose (and later joined by other Android users).

> Rose alleged that between September 2024 and June 2025, Meta exploited Android's localhost -- a feature that allows software developers to test applications -- to connect users’ mobile web browsing to their Facebook and Instagram profiles.

May 12, 2026

woodrowbarlow

an hour ago

i would love to have a software engineer's union, not so much to get better working conditions but to be able to say stuff like "i can't implement that unethical feature, it's against union rules and i'd lose my membership".

volkercraig

39 minutes ago

Start one. Unions are worker owned. You could also join the IWW.

absqueued

an hour ago

Take a lead, let me sign up :)

SoftTalker

19 minutes ago

And this is why we don't have one. Someone else is expected to do the hard part.

theodorejb

18 minutes ago

You don't need to join a union to push back against unethical feature requests.

jakubadamw

14 minutes ago

The collective leverage of a union gives you significantly more power to do something like this.

theodorejb

8 minutes ago

Only if the union is against the unethical request. In some cases the union may be for it, which makes it even harder to push back.

chrncirurp

13 minutes ago

> You don't need to join a union to push back against unethical feature requests.

If you push back against unethical feature requests:

No union: you get fired

Union: you still get fired

woodrowbarlow

4 minutes ago

maybe, but the union could provide a lot of services to someone who loses their job this way (like income insurance and legal services) and could leverage collective power over companies that demonstrate a pattern of behavior.

jeffgreco

4 minutes ago

Still a better outcome than tossing your ethics overboard.

KomoD

2 hours ago

Looks like they stopped doing it

https://localmess.github.io

> UPDATE: As of June 3rd 7:45 CEST, Meta/Facebook Pixel script is no longer sending any packets or requests to localhost. The code responsible for sending the _fbp cookie has been almost completely removed. Yandex has also stopped the practice we describe below.

mozvalentin

an hour ago

Chrome and Firefox have deployed / are deploying local-network-access which prompts the user when apps try this.

pezgrande

27 minutes ago

I guess that's why I am getting so many "Allow to find devices on your network" alerts. Good feature overall.

SoftTalker

17 minutes ago

Only a good feature if users have a clue what that question means. Most will click "Yes" because they want to get on with whatever they want to do.

Change it to something like "This website is trying to spy on your local devices, do you want to allow this?"

shit_game

an hour ago

I was just about to say that my question in regards to this was "what are web browsers doing about it?"

Tade0

an hour ago

I've seen it and at least in Chrome it seems to be treating all URLs which are based on an IP address as "local", regardless of the class of the address.

kibwen

38 minutes ago

I'd be inherently suspicious of any website in the wild attempting to contact a bare IP address. Aside from localhost, my default assumption would be that such a website is either trying to circumvent my hosts file (or circumvent my other DNS configuration, e.g. pi-hole or DNS-over-HTTPS), malware trying to reach a command-and-control server, or malware trying to circumvent my adblocker.

throwa356262

23 minutes ago

Off topic: I wonder how hard it is to poison this type of data gathering?