We don't know for sure whether the impacted accounts were misused.
The severity of this bug was that the attackers could continue using your Facebook account pretending to be the real account holders, as they had your access token to provide them actual authentication to your account.
In the biggest-ever security breach after Cambridge Analytica scandal, Facebook on Friday admitted hackers broke into almost 50 million users' accounts by stealing their "access tokens" or digital keys. The attackers hijacked these access tokens, which helped them log into any of the millions of Facebook accounts.
The incident is believed to be the largest in Facebook's history.
In 2016 CA is hired by Donald Trump's USA presidential campaign. If people lose confidence in Facebook's handling of their personal information, they may spend less time or share less on the social network, limiting the company's ability to make money from their activity.
Under GDPR, companies that don't do enough to safeguard their users' data risk a maximum fine of €20 million ($US23 ($32) million), or 4 per cent of a firm's global annual revenue for the prior year, whichever is higher.
Cambridge Analytica, which denies the accusations, has since filed for voluntary bankruptcy in the United States and Britain.
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They want answers from the Facebook boss after millions of users were left vulnerable to identity fraud in the biggest cyber attack on the social media giant since it was created in 2004. "This does mean they could access other third-party apps using Facebook login", Guy Rosen, Facebook's vice president of product, said.
Zuckerberg also alerted the breach on his Facebook page.
The sites have acknowledged finding on their platforms messages, accounts and pages associated with the Internet Research Agency, a Saint Petersburg operation that is alleged to be a "troll farm" connected to the Russian government. After they have logged back in, people will get a notification at the top of their News Feed explaining what happened.
It announced this year that it will require that the sponsors of political ads are identified and verified.
How did Facebook get to know about the hack?
"We've identified and removed fake accounts ahead of elections in France, Germany, Alabama, Mexico and Brazil", Zuckerberg said.
"I'm glad we found this and fixed the vulnerability".
Noted Taiwanese hacker Chang Chi-yuan promised to delete Zuckerberg's account, telling his 26,000 followers that the event would be livestreamed on Facebook Live, according to The Verge.