San Francisco: Facebook believes the data of up to 87 million people was improperly shared with the political consultancy Cambridge Analytica -- many more than previously disclosed.
The BBC has been told that about 1.1 million of them are UK-based.
The overall figure had been previously quoted as being 50 million by the whistleblower Christopher Wylie, BBC reported on Wednesday.
Facebook chief Mark Zuckerberg said "clearly we should have done more, and we will be going forward".
During a press conference he said that he had previously assumed that if Facebook gave people tools, it was largely their responsibility to decide how to use them.
But he added that it was "wrong in retrospect" to have had such a limited view.
"Today, given what we know... I think we understand that we need to take a broader view of our responsibility, that we're not just building tools, but that we need to take full responsibility for the outcomes of how people use those tools as well," he said.
Zuckerberg also announced an internal audit had uncovered a fresh problem. Malicious actors had been abusing a feature that let users search for one another by typing in email addresses or phone numbers into Facebook's search box.
As a result, many people's public profile information had been "scraped" and matched to the contact details, which had been obtained from elsewhere.
"It is reasonable to expect that if you had that (default) setting turned on, that in the last several years someone has probably accessed your public information in this way," Zuckerberg said.
The estimates of how many people's data had been exposed were revealed in a blog by the tech firm's chief technology officer, Mike Schroepfer.
BBC has also learned that Facebook now estimates that about 305,000 people had installed the This Is Your Digital Life quiz that had made the data-harvesting possible. The previously suggested figure had been 270,000.
About 97 per cent of the installations occurred within the US. However, just over 16 million of the total number of users affected are thought to be from other countries.
Facebook has faced intense criticism after it emerged that it had known for years that Cambridge Analytica had collected data from millions of its users, but had relied on the London-based firm to self-certify that it had deleted the information.
Cambridge Analytica said it had bought the information from the creator of the This Is Your Digital Life app without knowing that it had been obtained improperly.
During Zuckerberg's press conference, Cambridge Analytica tweeted it had only obtained data for 30 million individuals -- not 87 million -- from the app's creator, and again insisted it had deleted all records.
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Bengaluru, Aug 14 (PTI): Karnataka Deputy Chief Minister D K Shivakumar on Thursday said there was a “conspiracy” to tarnish the image of Dharmasthala.
His comments come amid an ongoing investigation by a Special Investigation Team (SIT) into serious allegations of mass burials in the revered temple town in Dakshina Kannada district.
“A conspiracy is being hatched to destroy hundreds of years of legacy. It is not correct to tarnish someone just like that. It has all happened due to one complainant,” he said.
Noting that some Congress MLAs have called for action against those involved in the slander campaign at the legislature party meeting, he said, “ I have told them that action must be taken against those who are indulging in a slander campaign. The CM has also said that action must be taken against such people.”
“I have information on this case. Religious feelings should not be hurt in any manner. Culprits must be punished,” he told reporters, according to a release from his office.
Responding to a question, Shivakumar said the Congress party will not allow the image of any religious place to be tarnished.
“We see everyone equally when it comes to religion,” he added.
The SIT, formed by the state government, is probing claims of mass murder, rape, and mass burials in Dharmasthala over the past two decades.
The complainant, a former sanitation worker whose identity has not been revealed, alleged that between 1995 and 2014 he was forced to handle bodies—including women and minors—and that some showed signs of sexual assault. He has given a statement before a magistrate.
As part of the probe, the SIT has been conducting exhumations at multiple locations identified by the complainant-witness in the forested areas along the banks of the Netravathi River in Dharmasthala, where some skeletal remains have been found at two sites so far.