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submitted by AdamCannon to r/technology
New phone, who dis —
Facebook scraped call, text message data for years from Android phones
Maybe check your data archive to see if Facebook’s algorithms know who you called.
Enlarge /
This screen in the Messenger application offers to conveniently track
all your calls and messages. But Facebook was already doing this
surreptitiously on some Android devices until October 2017, exploiting
the way an older Android API handled permissions.
Facebook
This experience has been shared by a number of other Facebook users who spoke with Ars, as well as independently by us—my own Facebook data archive, I found, contained call-log data for a certain Android device I used in 2015 and 2016, along with SMS and MMS message metadata.
The spokesperson pointed out that contact uploading is optional and installation of the application explicitly requests permission to access contacts. And users can delete contact data from their profiles using a tool accessible via Web browser.
Facebook uses phone-contact data as part of its friend recommendation algorithm. And in recent versions of the Messenger application for Android and Facebook Lite devices, a more explicit request is made to users for access to call logs and SMS logs on Android and Facebook Lite devices. But even if users didn't give that permission to Messenger, they may have given it inadvertently for years through Facebook's mobile apps—because of the way Android has handled permissions for accessing call logs in the past.
If you granted permission to read contacts during Facebook's installation on Android a few versions ago—specifically before Android 4.1 (Jelly Bean)—that permission also granted Facebook access to call and message logs by default. The permission structure was changed in the Android API in version 16. But Android applications could bypass this change if they were written to earlier versions of the API, so Facebook API could continue to gain access to call and SMS data by specifying an earlier Android SDK version. Google deprecated version 4.0 of the Android API in October 2017—the point at which the latest call metadata in Facebook user's data was found. Apple iOS has never allowed silent access to call data.
Facebook provides a way for users to purge collected contact data from their accounts, but it's not clear if this deletes just contacts or if it also purges call and SMS metadata. After purging my contact data, my contacts and calls were still in the archive I downloaded the next day—though this may be because the archive was still the same cache I had requested on Friday.
As always, if you're really concerned about privacy, you should not share address book and call-log data with any mobile application. And you may want to examine the rest of what can be found in the downloadable Facebook archive, as it includes all the advertisers that Facebook has shared your contact information with, among other things.
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