Facebook said the FBI is investigating, but asked the company not to discuss who may be behind the attack.
The 29 million affected users, along with 1 million whose security tokens were taken but did not appear to have their data stolen, will be receiving customized messages from Facebook identifying specifically which types of information on their profiles, if any, were involved in the breach.
In a statement, Facebook said that hackers accessed the name, contact details and other information of the accounts of 14 million people. Over the coming days, Facebook will begin alerting people whose information was exposed, which will let them know whether they were part of the 14 million or 15 million group.
Facebook said Friday that hackers compromised the accounts of 30 million users last month - about 20 million fewer accounts than it first reported last month.
Facebook also stated that the attackers did not have access to information related to other Facebook services such as Messenger, Messenger Kids, Instagram, WhatsApp, Oculus, Workplace, Pages, payments, third-party apps, or advertising or developer accounts. And if yes, Facebook says hackers will not be able to retrieve any more information (that what they have already had access to) from your compromised accounts.
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If an affected person was a Page admin whose Page received a message from someone over Facebook, then the hackers would've been able to view the content.
In the tech world, the term "access tokens" refers to digital keys that keep people logged in to sites so they don't need to re-enter their password every time they want to use an app or website.
Users can visit the Facebook "Help Centre", to see whether they were affected and what information was stolen, including the last ten places they checked in, their hometown and last ten searches they made. The vulnerability enabled the attackers to get an access token for Tom's account as well, and the attack spread from there.
But what should you do if your account has been affected? Attackers chained 3 vulnerabilities together to exploit a bug in this feature and steal a user's, and their friends, access tokens.
In the Facebook Help Center, scroll down to where it says "Is my Facebook account impacted by this security issue?"
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Saudi officials say the journalist left the consulate after his brief visit, rejecting the Turkish claims as baseless. Mr Trump told reporters he had talked to the Saudi authorities "at the highest level" about Mr Khashoggi .
Out of those 30 million, hackers successfully accessed data from 29 million Facebook members.
The data that has been accessed is not only highly revealing private information, but is precisely the sort of data that could be used for identity theft and social engineering.
Additionally, Facebook advises people to be wary of unwanted phone calls, text messages and emails.
Once they had the tokens for the seed accounts, Rosen said the attackers used the tokens to access the 400,000 accounts and deployed scripts to harvest even more tokens at a larger and automated scale. You might truly be surprised by how much data Facebook has on you.
This, as it sounds, is very bad.
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They added that Hamas leader Ismail Haniya also attended the protests east of Gaza City and hailed the ongoing demonstrations. Israeli security personnel have been deployed in large numbers around the Palestinian village of Khan al-Ahmar, sources said.