Phone numbers belonging to more than 11.5 million UK residents have been leaked online as part of a huge Facebook security breach, hackers claim.
The hoard of personal data, which first surfaced in June and contains records for around 533 million Facebook users, was dumped on a hacker forum on Saturday for anyone to access by paying a nominal fee.
Security researchers and news reports said the data appears to be real, and includes mobile phone numbers for Facebook’s chief executive, Mark Zuckerberg, as well as his co-founders Chris Hughes and Dustin Moskovitz.
The forum user who posted the trove claimed that it contained 11,522,328 records from the UK, alongside users in 105 other countries including 19.8 million from France, 35.7 million from Italy, and 32 million from the US.
The leaked information includes phone numbers, full names, locations, birth dates, biography text and email addresses, as well as Facebook identifier numbers. It does not include any passwords or private messages.
Dave Walker, a British cybersecurity consultant based in London, said he had found details for “a number of celebrities” inside the database, along with several of his friends.