California: Facebook says a bug in its system caused 6 million users' contact information to be inadvertently exposed.
The social media company said Friday that a bug led to users' contact information, such as email addresses or phone numbers, to be accessed by other users who either had some contact information about that person or some connection to them.
Facebook said in a blog post that the cause of the bug is "pretty technical" but that the problem is tied to its "Download Your Information" tool.
The company uses the information that users upload to better tailor the friend suggestions it issues. The bug caused some of this information to be inadvertently stored in association with a person's contact information as part of their Facebook account.
As a result, if someone downloaded an archive of their Facebook account through the "Download Your Information" tool, they may have been provided with additional addresses or telephone numbers for their contacts or people with whom they have some connection. Because the contact information was provided by other people on Facebook, it was not necessarily accurate.
Facebook said it has fixed the problem and is in the process of notifying affected users via email.
The affected accounts represent only a fraction of the over 1 billion users on the social media site.
Facebook, which is headquartered in Menlo Park, Calif., said that it has no evidence that the bug has been used maliciously and it has not received complaints.
Here is what the apology letter from Facebook says:
Your privacy is incredibly important to everyone who works at Facebook, and we're dedicated to protecting your information. While many of us focus our full-time jobs on preventing or fixing issues before they affect anyone, we recently fell short of our goal and a technical bug caused your telephone number or email address to be accessible by another person.
The bug was limited in scope and likely only allowed someone you already know outside of Facebook to see your email address or telephone number. That said, we let you down and we are taking this error very seriously.
Describing what caused the bug can get pretty technical, but we want to explain how it happened. When people upload their contact lists or address books to Facebook, we try to match that data with the contact information of other people on Facebook in order to generate friend recommendations. Because of the bug, the email addresses and phone numbers used to make friend recommendations and reduce the number of invitations we send were inadvertently stored in their account on Facebook, along with their uploaded contacts. As a result, if a person went to download an archive of their Facebook account through our Download Your Information (DYI) tool, which included their uploaded contacts, they may have been provided with additional email addresses or telephone numbers.
Here is your contact Information (inadvertently accessible by at most 1 Facebook user):
Mobile number: **********
E-mail: *********@gmail.com
We estimate that 1 Facebook user saw this additional contact info displayed next to your name in their downloaded copy of their account information. No other info about you was shown and it's likely that anyone who saw this is not a stranger to you, even if you're not friends on Facebook.
We recognize that mistakenly sharing contact info is unacceptable, even if you are acquainted with people who saw these details, and we've taken measures to prevent this from happening again. For more information on the bug, please read our blog post.
All of us at Facebook take this issue very personally. We appreciate your ongoing use of Facebook, and are working every day to deliver the level of service you expect and deserve.
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