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A database of Facebook users’ phone numbers found online

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Re: A database of Facebook users’ phone numbers found online

#51

Heads up: T-mobile will allow you to take over an account if you can guess one of the most recent phone numbers that the target account has called.

That sounds very secure indeed. Nobody would ever guess that I'd recently called my folks! /s

No one would ever guess that my target called me back after I left a frightening voicemail also!

Re: A database of Facebook users’ phone numbers found online

#52
post #45
post #25

Heads up: when Facebook asks you to give them your phone number to "prevent you getting locked out of your account", they really just want it so they can identify your other profiles in datasets they've bought/own (e.g. WhatsApp). If you've ever given the service your number, you should consider your real identity linked to it.

> If you've ever given the service your number, you should consider your real identity linked to it. I have a feeling it's worse than that. (I haven't rigorously perused the ToS, if I'm wrong please lmk.) Let's say your friend John has an iPhone and saves your name and # in their contacts. One day John installs the Facebook app & opens it. John is not technical and when the app requests permissions he taps 'Allow'. A…

Your feeling is correct. It's been shown by researchers (incl. me) and confirmed by Facebook that they're doing that: https://gizmodo.com/facebook-is-giving-advertisers-access-to...

Re: A database of Facebook users’ phone numbers found online

#53
That's egregious but have you ever looked yourself up on any one of those crazy info scraping sites? usphonebook.com and dozens of their ilk? You might be shocked by what you find. Some colleagues had all old email addresses listed, not to mention correct current address and associated persons.

Point is, Facebook probably already have it, the Enemy probably can easily get it.

Facebook is of course evil, I don't want to diminish their scraping and also security mishaps.

Re: A database of Facebook users’ phone numbers found online

#55
post #35

Earlier quoted context omitted.

Brings to mind a question, I've got a throwaway google voice number for precisely this reason, some services will let me use it, others (even Google-tried using a GVoice number as a recovery phone number for a gmail account for my grandmother, nothing doing) wont, few just throw back a generic error, others will say they don't allow virtual DIDs. Someone's going to say that's to cut down on fraud/increase security, r…

Real security is picking a unique password and not forgetting it. Letting someone handle your security by giving them your phone number in case you can't handle it was never a good idea. Get a password safe, and don't forget your complex passwords.

2FA (through an third-party like an email provider or, even, dare I say it, an SMS provider; not TOTP) continues to protect you when your password is compromised by a backend-side database breach. They might get your password; they might get your TOTP token seed; but there's nothing in the DB that will allow them to receive an email as you and then click the link in said email.

Yes, allowing someone to reset their password through a second factor is bad; but that's not 2FA, that's two independent 1FAs.

Re: A database of Facebook users’ phone numbers found online

#56

Facebook: "This dataset is old and appears to have information obtained before we made changes last year to remove people’s ability to find others using their phone numbers." Not that "old." Some of those "update" dates are just a few days ago.

How many people change their phone numbers more than once a decade? How many people change their facebook accounts ever? The age of this data may be "old" by whatever definition Facebook is using, but it is still of great interest to identity thieves and ne'er-do-wells.

Yep. As far as I’m accustomed most people do whatever they can to maintain their phone numbers even across services. So much so that it’s law in Canada a provider can’t lock in your number and must let you take it with you to another provider.

Re: A database of Facebook users’ phone numbers found online

#57
post #25

Heads up: when Facebook asks you to give them your phone number to "prevent you getting locked out of your account", they really just want it so they can identify your other profiles in datasets they've bought/own (e.g. WhatsApp). If you've ever given the service your number, you should consider your real identity linked to it.

> you should consider your real identity linked to it What is the point of these products if not linked to my real identity? That’s the whole idea of them. I use Facebook and WhatsApp to talk to people who know me. That’s why they want to talk to me. If they didn’t know my identity they would want to talk to me.

Of course your real identity is probably involved somewhere. It's just that I, and many others like me, don't think a third party should know what my real identity is. It's not their business.

Edit: Unfortunately it probably is their business. A poor choice of words.

Re: A database of Facebook users’ phone numbers found online

#58
post #25

Heads up: when Facebook asks you to give them your phone number to "prevent you getting locked out of your account", they really just want it so they can identify your other profiles in datasets they've bought/own (e.g. WhatsApp). If you've ever given the service your number, you should consider your real identity linked to it.

> you should consider your real identity linked to it What is the point of these products if not linked to my real identity? That’s the whole idea of them. I use Facebook and WhatsApp to talk to people who know me. That’s why they want to talk to me. If they didn’t know my identity they would want to talk to me.

Network graphs.

Off the top example: If four of your friends are buying gifts for your baby shower, this is a signal that your other friends have the intent to buy baby gifts and could be marketed to.

Re: A database of Facebook users’ phone numbers found online

#59
post #44

Wow, a phone book. Do HN readers know you can buy lists of millions of people's names and phone numbers from companies whose sole purpose is collecting them, like infogroup?

Yes, you can get tons of personally identifiable information from things like public records laws and such. That's irrelevant, though. This is a phone number tied to a facebook account, not just their name.

A major difference here is the ability - at scale - to associate people with their facebook accounts. There are people who do not want to be associated with by their facebook account, and reasonably so. Not sure why you don't think that wouldn't be a big deal.

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