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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Mumbai: The newly appointed captain of the Indian T20 cricket team, Suryakumar Yadav, confirmed that Hardik Pandya's role in the team would remain unchanged. In a media interaction, Yadav emphasized Hardik's importance to the team and praised his contributions during the 2024 T20 World Cup in England.

"Hardik's role has always been the same. He is a very important player for the team. The way he performed in the World Cup, I hope he will continue to do the same," Suryakumar told PTI.

The announcement of Yadav as the new T20I captain raised questions among fans about his relationship with Pandya, particularly after the close race for captaincy. However, both players respect each other and often bond during training sessions.

Addressing the change of captaincy, Yadav reassured fans that the team's aggressive brand of cricket would only grow stronger.

"The same train will go ahead; only the engine has changed and the bogies remain unchanged," Yadav explained. "Nothing changes; the brand of cricket remains the same. It doesn't change anything. It has given me an added responsibility. It is good that now I can do a 'walk the talk'."

Reflecting on Rohit Sharma's leadership, Yadav expressed his admiration for his predecessor. "What I have learned from Rohit is that he was always a leader on the ground and off it. He was not just a captain, there is a lot of difference between the two. He was a leader who stood in the middle of the group and showed people the way. How to play T20 cricket and how to win a tournament? That is what I have learned from him," he elaborated.

In addition to the captaincy change, Shubman Gill has been declared the vice-captain for both the ODI and T20I teams, replacing Hardik Pandya. Hardik Pandya will continue as an all-rounder for the T20I series against Sri Lanka, scheduled to begin on July 27.