Live data from Hacker News

Facebook Is Giving Advertisers Access To Your Shadow Contact Information

gizmodo.com

251–260 of 478 posts

Re: Facebook Is Giving Advertisers Access To Your Shadow Contact Information

#252

I'm not sure I understand what's going on here and the article doesn't really explain. What does it mean that they are "using your 2FA phone number"? It doesn't seem like they are texting ads to people. Are they just using the area code to determine where you live?

No, they are using the phone number for "custom audience" targeting, where advertisers upload lists of phone numbers of users to target.

Re: Facebook Is Giving Advertisers Access To Your Shadow Contact Information

#253

Inaccurate headline. Being targetable is different than them "giving access" to the information. The actual information is not shared with anyone.

Correlation is information. People are slowly beginning to learn that basic information theoretic fact.

Re: Facebook Is Giving Advertisers Access To Your Shadow Contact Information

#254

I'm not sure I understand what's going on here and the article doesn't really explain. What does it mean that they are "using your 2FA phone number"? It doesn't seem like they are texting ads to people. Are they just using the area code to determine where you live?

Multiple devices and linking them to a single person is an active area of development. Say your phone you’ve never signed into Facebook on safari, so Facebook won’t know what account it is. But you sign into some other service that you give it your phone. Since phone is pretty uniquely identifying, the two companies share info and thus Facebook knows that safari browser is you and can track everything you do to your account.

Re: Facebook Is Giving Advertisers Access To Your Shadow Contact Information

#255

It’s a cycle. Facebook has been doing nasty shit and apologizing for it since 2003. I’m starting to think they aren’t actually sorry. https://www.wired.com/story/why-zuckerberg-15-year-apology-t...

Right, because Move fast and break stuff is their mantra. I'm surprised that articles doesn't even mention it.

Perhaps Move fast and hurt people would be more honest. I think it's rather catchy.

Re: Facebook Is Giving Advertisers Access To Your Shadow Contact Information

#256
post #234

> A spokesman also told us that users can opt out of this ad-based repurposing of their security digits by not using phone number based 2FA. That's one way to encourage people to use 2FA App, I guess.

Yeah, but it looks like it still doesn't work if you switch to the app after having given them your phone number for 2FA. The sentence that follows your quote says:

>>(Albeit, the company only added the ability to do non-mobile phone based 2FA back in May, so anyone before then was all outta luck.)

Re: Facebook Is Giving Advertisers Access To Your Shadow Contact Information

#257
I had a feeling that facebook does it and remove my phone number from facebook a few years ago.

I'm fine living with the cost that if someone hacks into my facebook I'll just have to finally delete it. Maybe using app like Google authenticaticator would solve the problem, but then I'd have to think of all of the nefarious ways facebook will leverage that against me.

Right now I'm trying to get into a habit of checking out facebook only from (the same) my home desktop computer once a week.

Re: Facebook Is Giving Advertisers Access To Your Shadow Contact Information

#258

I think it's much worse when HTC places ads on your phone via bloatware apps that can't be uninstalled. That's absolutely vicious and hardly ever gets any press time. But, oh, facebook makes a minor little slip up and they even FIX the problem and everyone looses their heads over it.

One of the bloatware apps that I can't remove from my phone is Facebook :)

Thanks, Sprint!

Re: Facebook Is Giving Advertisers Access To Your Shadow Contact Information

#259

I'm not sure I understand what's going on here and the article doesn't really explain. What does it mean that they are "using your 2FA phone number"? It doesn't seem like they are texting ads to people. Are they just using the area code to determine where you live?

Advertisers can upload lists of phone numbers that represent people they want to see their ads. Facebook matches those up with your 2FA phone number to show you those ads.

Re: Facebook Is Giving Advertisers Access To Your Shadow Contact Information

#260

It should be already well understood that free services aren't free. To me the moral issue of the story is how Facebook isn't upfront about "the cost" of the services they provide. You want to use facebook to get in touch with friends? We all now know that you will be targeted by ads customized with every piece of information that you reveal (and some bits that you are not even aware you are revealing...) Assume that…

Also, it's one thing to willingly give up your own data in exchange for using Facebook etc for free, but often the data they collect could reasonably considered other people's - for instance uploading your contact book to "find friends" tells Facebook what names to associate with phone numbers and helps them build "shadow profiles" (or whatever the term they use is) for users who haven't given them anything.
Post reply on HN