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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

#41
post #29

Earlier quoted context omitted.

It was still reported to HIBP, its probably a worthwhile search.

Off topic, but I'm amused to see xkcd was hacked. And that its database used MD5 for hashing emails, passwords, and IP addresses!

Really it was their PHPBB forum heh. MD5 is so lame for passwords tho.

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

#42
post #35
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.

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.

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

#43
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.

That's not the only reason. They also allow advertisers to target based on specific phone numbers. It's one of the creepiest features, along with targeting based on e-mail.

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

#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'. At that point AFAICT there's nothing stopping Facebook from snagging your name & number and populating a ghost profile, or corroborating a real one.

In other words, if you've ever shared your phone number to someone who uses the Facebook app who doesn't dutifully and consistently reject permissions prompts, it's probably already too late.

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

#46
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?

depends on the jurisdiction. In Germany this is a grey area or outright forbidden depending on the case, and this dump apparently contains numbers from numerous jurisdictions.

Also, needlessly to say someone who gives facebook their phone number for verification purposes does likely not expect that the data is leaked or sold without their permission.

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

#48
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…

Facebook frequently suggested my own mobile number to add it to my account when after I logged into the mobile webpage via phone (I never used any Facebook apps).

My only explanation for that was exactly that it had been farmed from a friends contact list.

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

#49
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.

WhatsApp was specifically designed to be encrypted and private. Facebook, however, seems to play fast and loose with data. Sure you can talk to John Doe, but you might hope no one else knows that you're talking to John or what you're talking about. Useful, for example, to report a government conspiracy to a reporter.

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

#50
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…

Would rather not share the details here, but I know of one instance of a person having been found on Facebook via her phone number even though she never provided it - just one imprudent person who has your number associated with your real full name is enough for this to happen.
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