In discussions on Facebook today, a story in The Guardian came up, and it’s led to a great deal of concern. The long and short of it is that if you’re running the Facebook app, on your iPhone or on an Android device, it seems that there’s an excellent likelihood that the app has (possibly without your knowledge, and possibly without your consent) uploaded the phone numbers of everyone in your personal address book.
After reading the story, I went and checked the “Phonebook” page and what I found was distressing: indeed, every single contact in my iPhone’s address book, between 1,500 and 1,600 had been uploaded to Facebook. This included a number of confidential, business-related numbers that were still in there from my last employer.

I wasn't actually interested in "sharing" these. Very "radical transparency".
Even more distressingly, when I checked on my iPhone, the “Sync Contacts” feature was turned off, as I thought it would be. We’ve verified similar behavior in the Android version of the app.
Since Facebook offers you absolutely no help whatsoever on their site for disabling this feature, by the way—much good it does you—you have to go to the main screen of the application by tapping on the button with a grid of nine little squares in the upper left-hand corner of the screen, then tap on “Friends”.

The "Sync" button is in the upper right-hand corner
Next, tap on the “Sync” button in the upper right-hand corner of the friends list. From the “Sync Contacts” screen, you can turn off the app’s ability to both upload your contacts (presumably) and to replace your address book photos with its own (frequently incorrect, it seems) choices.

This is how I found the settings when I checked them
Note that the wording on the option gives no suggestion that the app is going to be tiptoeing through your Address Book and handing whatever it finds over to the Zuckerberg gang: it merely says that it will “Add Facebook profile pictures and links to Contacts”, presumably when they don’t otherwise exist, since the second option gives the description, “Replace existing photos in your Contacts”.
Facebook says that, to get this information the hell off there, you have to first turn off the “Sync Contacts” feature in your phone’s app, and then go to a particular page to get them taken off the site. I did that, and going-on-three hours later, they’re still there.
What’s possibly worse, is that I’m seeing people in “my phonebook”, with phone numbers, and I have absolutely no idea at all who they are. I’m being invited to add them as a friend, but maybe I’m being encouraged to just, I dunno, give ‘em a call first…? This is crazy. Is my personal number, or yours, now showing up in the Facebook “phonebooks” of random strangers? That’s transparency that’s just a mite too radical for me. I’m sure every freak stalker on the Internet is thanking Mark Zuckerberg and his pals, though.

"Yeah, we're going after the obsessive stalker segment, that's huge!"
I know a lot of you out there are using the Facebook app if you have an iPhone, an Android phone, a Blackberry or a Symbian S60 device. I want to try to understand if this is indeed as serious a problem as it seems to be, and if so, the circumstances under which it is and isn’t occurring.
If you use a Facebook app on a smart phone, please do the following:
- Check whether the “Sync Contacts” setting is on or off on your phone.
- Go to your “Phonebook” page, and see whether your address book contacts have been uploaded to Facebook. If you see entries which say “Invite to join Facebook”, that’s a contact that Facebook has uploaded from your personal address book. Also note whether your seeing the names, photos and phone numbers of people you’ve never heard of previously.
- Leave a comment telling me a) whether “Sync Contacts” was on or off; b) whether your personal contacts had been uploaded; c) whether you’re seeing the phone numbers of complete strangers; and d) what kind of a smart phone you’re running the app on.
- Any other comments or observations you want to add.
I’m actually going to see if I can get some sort of comment from Facebook about what’s going on with this in the morning, but this seems like a potentially huge exposure of data, and a completely irresponsible one.
UPDATE: To find the “Phonebook” page from within Facebook, select “Edit friends” from the “Account” pulldown at the upper right-hand corner of any page. When your friends list loads, click on the “Phonebook” link in the sidebar on the left side.
UPDATED UPDATE: Facebook’s “remove all the information you sucked out of my phone” function does, as near as I can tell, nothing at all, or if it does, it’s taking more than nineteen hours to do it. I am not filled with a sense of warm confidence here.