Facebook: Hackers accessed 29 million accounts, fewer than thought

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The social media giant announced Friday that a Facebook hack last month compromised about 30 million users' names, phone numbers, emails and other personal details. It was part of a larger security breach of 50 million accounts the company disclosed about two weeks ago.

Thirty million people have been affected by a massive hack of Facebook, with the attackers gaining access to millions of victims' highly sensitive personal data.

The tokens allowed the hackers to steal name and contact details, which include phone number and/or email, for 15 million people.

Facebook has revealed around 30 million accounts were affected by a recent security breach.

Facebook reaffirmed that third-party apps were not accessed using the stolen tokens, and that the vulnerability did not affect other services the company owns, such as WhatsApp or Instagram.

Facebook now says nearly 30 million users were affected by a giant hack, but that the Federal Bureau of Investigation has asked it not to reveal the identity of the suspected culprit.

No data was accessed in the accounts of the remaining one million people whose "access tokens" were stolen, according to Rosen.

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.

If your account was accessed, Facebook will list what information the hackers obtained.

Facebook says it'll be reaching out to users to tell them what next steps they should take, but as always with these attacks, there are a few things you can do right now to ensure you're taking the right steps.

This pool of 400,000 users allowed them to steal access tokens from the full 30 million, he continued.

Facebook added that the bureau has asked it not to discuss who may be behind the attack.

Affected users will be notified on Facebook in the coming days, where they will be given details of the information accessed as well as advice on how to protect against any further attempts to exploit the breach. The company said it hasn't ruled out the possibility of smaller-scale attacks that used the same vulnerability. For 1 million people, the attackers did not access any information. Up to 90 million people were logged out of their accounts and had those tokens reset as a result of the bug's discovery.

To find out if your account has been affected, Facebook has provided this link. The hack involved a feature known as "View As", which enables users to see what their Facebook profile looks like when other users look at it.

This is very bad for Facebook.

Facebook's lead European Union data regulator, the Irish Data Protection Commissioner, last week opened an investigation into the breach.

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