Facebook said today the number of users who had their Facebook authentication tokens stolen in a security breach that took place last month is actually 30 million, and not 50 million, as the company initially announced.
Then, "for 15 million people, attackers accessed two sets of information - name and contact details (phone number, email, or both, depending on what people had on their profiles)".
Facebook believes only one million of the total compromised accounts had no personal information accessed whatsoever.
Nearly 30 million Facebook users' phone numbers and email addresses were accessed by hackers in the biggest security breach in the company's history, Facebook said Friday. While Russian agents had used Facebook and other social media to incite conflict before the 2016 election, domestic sources of false or misleading posts have jumped into the fray, the company said. For 14 million people, the attackers accessed the same two sets of information, as well as other details people had on their profiles.
The spotlight on tech companies intensified further this week as Google said that half a million accounts on its Google+ social networking service could have had information leaked as a result of a software bug.
According to Rosen, a tool in Facebook's help centre will now show users if they were affected and what information may have been exposed.
"The resources we are pointing people toward are based on the actual types of data accessed - including the steps they can take to help protect themselves from suspicious emails, text messages, or calls", the spokeswoman said.
The social media company said the FBI is investigating, but asked the company not to discuss who may be behind the attack.
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Facebook said it is working with the FBI to investigate the biggest hack in its history. The hackers used the access tokens from Sep.
Google ended up taking some heat off of Facebook after disclosing a potential data breach of its own earlier this week, though the scope of that incident was much smaller and only included some 500,000 users of Google+. Ultimately this got them access to about 400,000 people.
Facebook said the FBI is investigating, but asked the company not to discuss who may be behind the attack.
Facebook has also established a Web page at facebook.com/help/securitynotice?ref=sec that will inform its 2 billion users who are logged in whether their accounts were affected.
On September 14, Facebook engineers had detected some unusual activity on the social media platform's networks.
The only silver lining to this really dark cloud is that "Messenger, Messenger Kids, Instagram, WhatsApp, Oculus, Workplace, Pages, payments, third-party apps, or advertising or developer accounts" have not been affected by this specific attack.
Here's how to check whether your information was compromised, as well as how to delete your Facebook account. Facebook then goes into some detail on how it all went down, which starts with the attackers already having access to some accounts.
What can affected Facebook users do?