Facebook says the FBI is investigating a major security breach of its service, but the company says authorities asked it not to discuss who may be behind the attack.
On Friday, Facebook provided more details about the attack that it first disclosed two weeks ago - and said the Federal Bureau of Investigation had asked it not to discuss who might be behind the attack.
"We face constant attacks from people who want to take over accounts or steal information around the world", chief executive Mark Zuckerberg said on his own Facebook page when the breach was disclosed.
Facebook has admitted that hackers accessed the data of 29 million users on the social network by using people's friends lists to steal access tokens.
For about 14 million people the hackers accessed information such as the last 10 places that person checked into, their current city and their 15 most-recent searches.
Hackers stole neither personal messages nor financial data and did not use their access to accounts users' accounts on other websites, the company said.
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.
Facebook has revealed 30 million accounts were affected in a data breach last month. Of the 50 million people whose access tokens we believed were affected, about 30 million actually had their tokens stolen.
The breach came about after hackers stole "access tokens", which allow users to browse Facebook without having to login multiple times.
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The attackers apparently used some kind of automated method of grabbing access tokens from friends of accounts they already controlled. Up to 90 million people were logged out of their accounts and had those tokens reset as a result of the bug's discovery.
Users can check whether they were affected, and what information was accessed, by visiting Facebook's help center.
"We acted quickly to secure the site and took action to protect your account, and we're working closely with law enforcement to address the incident.Learn more about how your account was affected and what you can do in the Help Centre".
Facebook said engineers discovered a breach on September 25 and had it patched two days later. They could do so by exploiting three distinct bugs in Facebook's code.
Facebook said it was continuing to investigate whether the attackers took actions beyond stealing data, such as posting from accounts but had not found additional misuse.
Additionally, Facebook advises people to be wary of unwanted phone calls, text messages and emails.
The hackers also accessed almost everything 14 million users had on their profiles. On Thursday, Facebook disclosed that it had removed hundreds of accounts and pages used to spread disinformation in the United States.
Despite Friday's announcement, there are still many details about the hack that have not been made public, including who was behind it and if the attackers were targeting particular users or countries.
"Those personal details could be very easily be used for identity theft to sign up for credit cards, get a loan, get your banking password", he said.