Want to find the phone numbers of all your friends and some strangers, too? Just look inside your Facebook contacts page.
Dan Tynan, ITworld
Aug 11, 2011
Who are all these people, and what are their phone numbers doing on my Facebook contacts page? That’s the question I am now asking.
I have 987 Facebook friends, some of whom I actually know. A handful of them are on my Android phone. Most, if not all, of the contacts inside my mobile phone are now listed in Facebook – as well as numbers for things like the pizza joint down the street, which doesn’t have a Facebook page.
You know how it goes on Facebook – somebody you don’t know asks to be your friend, you look over their friends list, decide they probably aren’t an axe murderer or a Tea Party member, and you say Yes, because Facebook is a fairly low risk, low maintenance connection. And if they prove to be truly annoying you can always block or defriend them later.
The vast majority of these people did not voluntarily give me their phone numbers. Some probably would if I asked, others might decline. But Facebook just gave me all their numbers – no questions asked. Apparently it’s because they elected to share their contact information with the world, so Facebook took the next step and added their info to my list.
Want to see for yourself? Launch Facebook, click Account and then Edit Friends, then select Contacts from the menu on the left. You should see a long list of profile pictures with phone numbers attached.
My Facebook phonebook: Who are all these people?
It gets weirder. There are also people whom I do not know, who are not in my Android phone’s contact list, with whom I share no connection whatsoever and have no friends in common, who are in my Facebook phone book. Now Facebook is asking if I want to friend them. I have no idea why.
And some of them are minors.
Wait, it gets weirder still. As regular readers of TY4NS may remember, I have a few Facebook alias accounts that I use for testing. None of these have their own cell phones or contact lists, so I never imported any contacts to them. Yet these accounts also display the phone numbers of everyone in their respective friends’ lists. So despite what Facebook’s contacts page says, this has nothing to do with using Facebook’s mobile app.
As Swiss developer Kurt Von Moos points out, Facebook has been syncing mobile contacts this way for some time. I’d just never clicked the contacts page before.
He writes: ... with neither your knowledge or consent, [Facebook will] import ALL the names and phone numbers FROM your phone’s address book and upload them to your Facebook Phonebook app ... on Facebook.com, thus storing your private contact numbers on Facebook‘s servers. Once your phone is synced , Facebook will attempt to match the newly uploaded phone numbers to users that have listed the same phone number on their Facebook profile, whether you are friends with them or not.
Why exactly is Facebook storing all of those numbers on its servers? That’s a good question.
The problem: Many people give everyone on Facebook access to their contact information and may not even be aware of it. Freelance coder Tom Scott has created a Web app (called “Evil”) that randomly displays phone numbers unsuspecting Facebook users have made public, along with their profile picture. He blocks out the last three digits of each one, but they are visible on Facebook itself.
My advice: Stop sharing your phone number on Facebook. You can go to Facebook’s Remove Imported Contacts Page to delete the numbers of your friends (though when I tried to do that with one of my dummy accounts, it didn’t do a damned thing). You can go into your Account/Privacy settings, click Customize settings, and change access to your Contact Information so only select people can see your number. Or you can just delete your digits from Facebook and be done with it.
Would you just hand your phone number to a random stranger in a bar or on the street? Probably not. So why are you doing that on Facebook?
TY4NS blogger Dan Tynan’s Facebook phone number is literally a Facebook phone number; don’t dial it unless you enjoy getting an earful of fax noise.