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How does Facebook know which people know me?

  1. I haven't joined Facebook or had anything to do with it.

  2. A person invited me to join, so I got an email (it's immaterial that I've never met this person, it just happens that we're on a mailing list and she kindly invited the whole list to be her friends...)

  3. After the kind invitation from 2., Facebook reminds me that someone else invited me about three years ago. Well, I knew about that, and had at the time mailed that one separately to say thanks, but I don't want to join Facebook.

  4. Next, Facebook tells me there are other people I perhaps know on Facebook. There follows a list of people I do in fact know. Some of them are ETers, others not.

Not one of those people has invited me to join FB or be their friends (or anything nice). At least one is someone I've had no contact with for five years.

The only thing these people have in common is that, at one time or another, they have corresponded with me at the email address I received the FB mail at, so that address is in their email address books.

So, when you join Facebook, do you give them the right to peek into your address book and collect non-FB members' addresses?

by afew (afew(a in a circle)eurotrib_dot_com) on Sun Mar 7th, 2010 at 03:40:19 PM EST
They ask you if you want to let them mine your address book from whatever web based email address you have. They don't require it, though.

you are the media you consume.

by MillMan (millguy at gmail) on Sun Mar 7th, 2010 at 03:44:18 PM EST
[ Parent ]
OK, thanks for the info. Presumably people allow that without realizing quite what it means in terms of others' privacy.
by afew (afew(a in a circle)eurotrib_dot_com) on Sun Mar 7th, 2010 at 03:49:48 PM EST
[ Parent ]
Linked In is the same. I did't select opt-in to one or more address books though, explaining my initial freak out having completed a skeletal profile, the age of contacts returned. I don't use any IM. I don't subscribe to facebook or myface. Registering for Twitter just to peek a year ago was a mistake, too.

An application that lets users point a smart phone at a stranger and immediately learn about them premiered last Tuesday at the Mobile World Congress in Barcelona, Spain. Developed by The Astonishing Tribe (TAT), a Swedish mobile software and design firm, the prototype software combines computer vision, cloud computing, facial recognition, social networking, and augmented reality.

"It's taking social networking to the next level," says Dan Gärdenfors, head of user experience research at TAT. "We thought the idea of bridging the way people used to meet, in the real world, and the new Internet-based ways of congregating would be really interesting."

Read more...

Not that I've much to lose.

Diversity is the key to economic and political evolution.

by Cat on Sun Mar 7th, 2010 at 04:49:00 PM EST
[ Parent ]
It's taking social networking to the next level ...

is happy Sales Talk for being nosy, intrusive, assholes.

by ATinNM on Sun Mar 7th, 2010 at 04:54:18 PM EST
[ Parent ]
well, yeah :)

Diversity is the key to economic and political evolution.
by Cat on Sun Mar 7th, 2010 at 09:25:01 PM EST
[ Parent ]
hmm, worrying. If the person who invited you on either occasion was known to any of us, it's entirely possible it constructed the list from us as friends.

But other than that, I guess it went fishing in our address books. Which I didn't even know was possible.

keep to the Fen Causeway

by Helen (lareinagal at yahoo dot co dot uk) on Sun Mar 7th, 2010 at 03:47:24 PM EST
[ Parent ]
The previous inviter is only known to In Wales, of ET members.

As MillMan explains, they can get permission to fish if signers-up don't realize what they're allowing.

by afew (afew(a in a circle)eurotrib_dot_com) on Sun Mar 7th, 2010 at 03:52:05 PM EST
[ Parent ]
I think they work on taking all the people you know, then comparing the people who are friends of more than one of them, and sending back invites for those people. Im sure its mostly done without rifling through your email accounts.

Any idiot can face a crisis - it's day to day living that wears you out.
by ceebs (ceebs (at) eurotrib (dot) com) on Sun Mar 7th, 2010 at 04:28:39 PM EST
[ Parent ]
They do that, too.

En un viejo país ineficiente, algo así como España entre dos guerras civiles, poseer una casa y poca hacienda y memoria ninguna. -- Gil de Biedma
by Migeru (migeru at eurotrib dot com) on Sun Mar 7th, 2010 at 04:35:57 PM EST
[ Parent ]
That takes us back to the top-level query: how do they know who I know? I'm not on Facebook.

But the answer seems clear: a member can run a feature designed to find people they know on FB, using their email address book (for a web-based account). They probably don't realize (maybe are not clearly informed) that FB will store the addresses retrieved in a dbase.

by afew (afew(a in a circle)eurotrib_dot_com) on Sun Mar 7th, 2010 at 04:36:46 PM EST
[ Parent ]
Yes, I get invites sent to my work address, "blah de blah has invited you to join this shitty website" - not just for facebook but for other stuff like dating websites and other social networking things I've not heard of.

Ad astra per aspera
by In Wales (inwales aaat eurotrib.com) on Sun Mar 7th, 2010 at 04:41:38 PM EST
[ Parent ]
That results from an invitation, though.
by afew (afew(a in a circle)eurotrib_dot_com) on Sun Mar 7th, 2010 at 04:44:51 PM EST
[ Parent ]
Well there is the worry that the more authoritarian organisations will be able to use these social networking software pieces to aggregate left wing groups, environmental groups, etc. As a strategy to avoid this it might be a good approach if you are a member of these sites to add some random people as chaff to their understanding.

Any idiot can face a crisis - it's day to day living that wears you out.
by ceebs (ceebs (at) eurotrib (dot) com) on Sun Mar 7th, 2010 at 04:49:05 PM EST
[ Parent ]
In the US it's a given that various entities are data mining the internet.  At last report the number of false positives are giving them fits.  Some recent "information received" indicates they may be, in some manner, becoming more efficient.  They could have done this using non-standard, but known, computer information processing and decision making procedures without a leap in Information Processing Theory.

So ...

If you are reading this the probability of your internetting becoming part of a file is ever so-slightly increased by talking to US citizens.

by ATinNM on Sun Mar 7th, 2010 at 05:01:40 PM EST
[ Parent ]
They can run a search using your information against all the data they have in their database.  Then build a chain of valid inferences using ISA comparison operations to get the indirect connections.  

Straight forward Set Theory, in other words.

by ATinNM on Sun Mar 7th, 2010 at 04:52:02 PM EST
[ Parent ]
I never let facebook go through my address books, or any application for that matter.  Lots of addresses are people I don't want to send some random silly invite to, and for anyone else I'd search to see if they already had an account and if they didn't I'd leave them alone!!

Ad astra per aspera
by In Wales (inwales aaat eurotrib.com) on Sun Mar 7th, 2010 at 04:35:34 PM EST
[ Parent ]
You're not on the list.

You don't know me.

by afew (afew(a in a circle)eurotrib_dot_com) on Sun Mar 7th, 2010 at 04:37:22 PM EST
[ Parent ]
Don't speak to me.

STRANGER DANGER!!!

Ad astra per aspera

by In Wales (inwales aaat eurotrib.com) on Sun Mar 7th, 2010 at 04:38:59 PM EST
[ Parent ]
You don't want to be on facebook.

You don't know anyone.

En un viejo país ineficiente, algo así como España entre dos guerras civiles, poseer una casa y poca hacienda y memoria ninguna. -- Gil de Biedma

by Migeru (migeru at eurotrib dot com) on Sun Mar 7th, 2010 at 04:39:09 PM EST
[ Parent ]
I'm not on Facebook.

I am no one.

by afew (afew(a in a circle)eurotrib_dot_com) on Sun Mar 7th, 2010 at 04:43:13 PM EST
[ Parent ]
My god!  I was 100% fooled.  The Turing Test has been passed!

:-)

by ATinNM on Sun Mar 7th, 2010 at 05:04:03 PM EST
[ Parent ]
Whereas at least one poster here im not sure about ;)

Any idiot can face a crisis - it's day to day living that wears you out.
by ceebs (ceebs (at) eurotrib (dot) com) on Mon Mar 8th, 2010 at 07:04:44 AM EST
[ Parent ]
People aren't aware of the length of memory persistence on cybernetic systems.  Fortunately data retrieval and association technology are simplistic and brittle so only the most gross referential data and information can be extracted.
by ATinNM on Sun Mar 7th, 2010 at 03:59:20 PM EST
[ Parent ]
Yeah, I don't expect they're reading my disk or anything. Still, the gross referential data that is my email address is in their db without my having permitted them to have it (permission implied when you send a mail to someone).

Of course, I "unsubscribed" from their mails (as if I'd ever "subscribed").

by afew (afew(a in a circle)eurotrib_dot_com) on Sun Mar 7th, 2010 at 04:29:12 PM EST
[ Parent ]
when you join Facebook, do you give them the right to peek into your address book and collect non-FB members' addresses

Not automatically, but social networking sites have tools which allow you to ask the server to look for people you might know based on your webmail address book.

En un viejo país ineficiente, algo así como España entre dos guerras civiles, poseer una casa y poca hacienda y memoria ninguna. -- Gil de Biedma

by Migeru (migeru at eurotrib dot com) on Sun Mar 7th, 2010 at 04:04:50 PM EST
[ Parent ]
I was wondering about the same thing, not to long ago - all the lists of people I might know, had only in common that one time or the other they exchanged emails with me and were in my adressbook.

This confirmed my convicting not to become a member of facebook.

by Fran (fran at eurotrib dot com) on Sun Mar 7th, 2010 at 04:06:29 PM EST
[ Parent ]
I have wondered about this myself. The way it has to work is that those people have given facebook access to their email contacts when they signed up or tried to find people they knew on facebook. Facebook will then put those email addresses in a database and match the people who provided them when someone sends an invite to your address.
by nanne (zwaerdenmaecker@gmail.com) on Sun Mar 7th, 2010 at 04:25:48 PM EST
[ Parent ]
In Soviet America, Internet surfs you!

/oblig

Conservatives want live babies so they can raise them to be dead soldiers. - George Carlin

by Drew J Jones (myfriends@thisispancakes.com) on Mon Mar 8th, 2010 at 04:28:32 AM EST
[ Parent ]

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