Some 30 million user accounts were stolen in a huge hack of Facebook, the company has confirmed.

The breach – the worst in the company's history – appears to have been carried out by an unnamed attacker, Facebook suggested. It said the FBI was "actively investigating" the hacker, and that it had "asked us not to discuss who may be behind this attack".

The company had already announced that around 50 million users' data had been exposed when hackers stole login keys that allowed them to access profiles. But it wasn't clear how many of them had actually been used.

Now it has admitted that the attack saw personal data on 30 million people stolen.

The hackers accessed name, email addresses or phone numbers from those 29 million accounts. For 14 million of those accounts, hackers got even more data, such as hometown, birthdate, the last 10 places they checked into or 15 most recent searches. One million accounts were affected but hackers didn't gain information.

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Facebook says hackers were able to access millions of phone numbers and email addresses [cnbc.com]

Facebook says an attack on its network left the personal information of some 50 million users—perhaps you?—exposed to hackers. Who were the hackers, and what did they want? Facebook doesn't know, or won't say. “We have a responsibility to protect your data, and if we can’t then we don’t deserve to serve you,” Mark Zuckerberg said in a statement regarding Cambridge Analytica earlier this year. Well. You heard the man.