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Facebook has revealed more details about a huge security breach at the social network.Getty Images

A massive Facebook security breach affected fewer people than the company originally thought, but still millions of users had their phone numbers, emails and other information compromised, the tech giant said on Friday.

In September, the world's largest social network said it believed the breach impacted 50 million people. Attackers had stolen Facebook "access tokens" -- digital keys that let them access people's accounts without needing a password. On Friday, the company said hackers stole personal information from 29 million people.

"We are sorry this happened. We know we will always face threats from people who want to access accounts and steal information," Facebook VP of Product Management Guy Rosen said during a conference call. 

Hackers accessed names and contact details, such as emails and phone numbers, from 15 million people, Facebook said Friday. They also stole the same information from 14 million people, but the attackers gained access to other personal details such as a user's birth date, hometown and workplace. 

A total of 30 million people had their access tokens stolen, but 1 million people didn't have any information compromised, Facebook added.

The attackers also used a technique that let them steal access tokens from the friends of the accounts they already controlled, expanding their reach, Rosen said. 

In the wake of the data breach and a privacy scandal involving Cambridge Analytica, Facebook has been trying to rebuild trust with its 2 billion monthly active users. But the company's latest revelation about the breach highlights the risks that come with sharing personal information on a social network. 

The company said it's working with the FBI, which asked it not to discuss who might be behind the attack or whether they were targeting anyone in particular. So far, Facebook hasn't found any evidence that the hackers were able to access third-party apps like Tinder and Spotify that use a Facebook login. Rosen said Facebook has no reason to believe that the breach was related to the upcoming US midterm elections.

Facebook said users can check if they were affected by visiting the social network's Help Center. Accounts of the impacted users have been secured and they don't need to log out again or change their password. Facebook will also be sending a message to the 30 million people affected that includes advice on how they can protect themselves from suspicious e-mails and texts. The company is also working on contacting users who may no longer be on the social network.

As Facebook and law enforcement dig deeper into who was behind the attack, questions about how well the company handled the breach still linger.

"We are working very closely with regulators around the world to provide information that they need and to answer their questions," Rosen said.

First published Oct. 12, 10:23 a.m. PT
Update, 12 p.m.: Adds more background and information from conference call. 

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