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Ask HN: How has Facebook figured out my family doctor as a friend suggestion?

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51–60 of 64 posts

Re: Ask HN: How has Facebook figured out my family doctor as a friend suggestion?

#51
I have a similar, but even less connected case than a doctor: a contractor that worked on my basement. No friends or clients in common that I know of. I've never been to his office. Don't even know what town he lives in. I did use FB on mobile for a short while, but probably didn't allow location info (call me paranoid). I most definitely did not upload any contact list.

How can it be?

Re: Ask HN: How has Facebook figured out my family doctor as a friend suggestion?

#52

Earlier quoted context omitted.

I think we could reasonably disagree about whether or not it's nefarious. Siphoning everyone's contacts is iffy to start with.

It's not exactly without consent

My old manager wanted me to install WhatsApp. WhatsApp wanted to access my phone's address book so that it could upload all of my contact info to their [Facebook's] servers. I denied it, and it refused to work. I didn't want to share my contacts - I just wanted to communicate with a specific set of people. The only workaround I could find is back up and delete all my contacts before letting WhatsApp rummage through my address book.

I wouldn't say this practice is very "consensual".

Re: Ask HN: How has Facebook figured out my family doctor as a friend suggestion?

#53

I think Facebook also connects people who appear at the same wireless access points, so you could have received the suggestion once your phone connected to the Internet at the doctor's office.

Surprised this reply is this far down here.

The correct answer is that if you have the FB app installed, it tracks your location. If you are in any place with another person with the FB app also installed multiple times, it assumes you two know each other.

It is why therapists and other medical professionals should not have FB (or any social network app, for that matter) installed on their phone (or, alternatively, on while in the work place).

Re: Ask HN: How has Facebook figured out my family doctor as a friend suggestion?

#54

Earlier quoted context omitted.

I'm glad you covered the bi-directional aspects of the association. A number of years ago FB had a vulnerability I discovered whereby it was possible to register an account with an e-mail you don't own. Obviously it wouldn't be possible to then verify the account if the owner of the e-mail targeted failed to click on the verify link. To get around this, upon first authenticating with the account after registration it…

This was easy to do as late as 2010. I haven't tried it recently but it was a common attack for quite a while: https://caseysoftware.com/blog/social-media-for-social-evil-...

At the time a number of us were arguing with FB that it was a vulnerability. How times have changed.

Re: Ask HN: How has Facebook figured out my family doctor as a friend suggestion?

#55
post #52

Earlier quoted context omitted.

It's not exactly without consent

My old manager wanted me to install WhatsApp. WhatsApp wanted to access my phone's address book so that it could upload all of my contact info to their [Facebook's] servers. I denied it, and it refused to work. I didn't want to share my contacts - I just wanted to communicate with a specific set of people. The only workaround I could find is back up and delete all my contacts before letting WhatsApp rummage through m…

You wanted to use the app. The app makes the rules. Either use it or don't. I don't see how they had a gun to your head.

Re: Ask HN: How has Facebook figured out my family doctor as a friend suggestion?

#56
post #52

Earlier quoted context omitted.

My old manager wanted me to install WhatsApp. WhatsApp wanted to access my phone's address book so that it could upload all of my contact info to their [Facebook's] servers. I denied it, and it refused to work. I didn't want to share my contacts - I just wanted to communicate with a specific set of people. The only workaround I could find is back up and delete all my contacts before letting WhatsApp rummage through m…

You wanted to use the app. The app makes the rules. Either use it or don't. I don't see how they had a gun to your head.

Sure, as Congressman Sensenbrenner said, “Well, you know... nobody’s got to use the Internet”

http://wapo.st/2nPh3JN

Re: Ask HN: How has Facebook figured out my family doctor as a friend suggestion?

#57
post #48

We've gone through this many times, its nothing nefarious. 1) doctor uploads his contacts (phone number/email addresses) to facebook and sets his contact info 2) you upload your contacts and set your contact info if there's one match between them, facebook believes (correctly) that there is some sort of existing relationship between you. The fact that its professional and not personal and you want facebook to just be…

No,your doctor actually is not allowed to upload your contact information as a patient to Facebook. It is against regulations. Patient information is private, including contact information. If he or she has done so it IS nefarious.

The suggestion is that as you go to your nearest doctor's office (or one of the nearest) you're likely to have social friends in common.

Re: Ask HN: How has Facebook figured out my family doctor as a friend suggestion?

#58

We've gone through this many times, its nothing nefarious. 1) doctor uploads his contacts (phone number/email addresses) to facebook and sets his contact info 2) you upload your contacts and set your contact info if there's one match between them, facebook believes (correctly) that there is some sort of existing relationship between you. The fact that its professional and not personal and you want facebook to just be…

Thanks for your reply but I have no idea why this is the top voted reply as it does not consider my factors . As noted by others:

1) The doctor/practice does not have my latest mobile phone number as I have not been to them in years. Having said that, it may be an old number on which I used to use Facebook. This friend suggestion is only in the past few months, which suggests that they are mining friend circles in historic usage data - everyone you know, and ever knew. All that being said, this would require my doctor to have my personal mobile number on her personal mobile phone on which she would have used Facebook at some point in time, which is absolutely impossible in a professional setting.

2) I have not installed Facebook on my current phone.

I'm still not convinced by any argument here, beyond the doctor actively looking me up on Facebook personally outside work.

Re: Ask HN: How has Facebook figured out my family doctor as a friend suggestion?

#59

We've gone through this many times, its nothing nefarious. 1) doctor uploads his contacts (phone number/email addresses) to facebook and sets his contact info 2) you upload your contacts and set your contact info if there's one match between them, facebook believes (correctly) that there is some sort of existing relationship between you. The fact that its professional and not personal and you want facebook to just be…

I think the original asker said he had never uploaded his contacts. Presumably though Facebook could just follow the reverse relation from the doctor without needing to confirm that it goes both ways.

Thanks for reading my post and noting this. I'm not sure the reverse relation applies either as it would require the doctor to have my personal contact on her mobile which is absolutely not the case as this is a shared practice and I haven't been to her in years.

Re: Ask HN: How has Facebook figured out my family doctor as a friend suggestion?

#60

Besides every other suggestion here, couldn't it be that your doctor actually is a friend of a friend?

Not possible as zero mutual friends, unless second degrees are considered which based on all other suggestions is not the case and would naively scale factorially (?).
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