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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Hyderabad (PTI): Telangana Chief Minister A Revanth Reddy met Union Home Minister Amit Shah in Delhi on Wednesday night and urged him to increase the sanctioned strength of IPS officers to the state in view of its growing administrative and security needs.

The two leaders also discussed the recent surrender of several senior Maoist leaders before the Telangana Police and other issues.

"During the meeting, the two leaders discussed the issue of Maoist surrenders and their rehabilitation. The chief minister informed Shah that significant improvements in policing have taken place in Telangana over the past two years," an official release here said.

Highlighting that 591 Maoists have laid down their arms and joined the mainstream of society during this period, the chief minister said the state government was providing them compensation and rehabilitation assistance as per the rules.

He requested the Union home minister to extend financial support from the central government for development works in the backward regions of the state.

Reddy also urged Shah to increase the sanctioned strength of IPS officers to the state from 83 to 105 in line with the state's growing administrative and security needs, the statement said.

The first cadre review after the formation of Telangana was conducted in 2016, while the next review, due in 2021, was delayed and finally carried out in 2025. Even then, only seven additional IPS officers were allocated to the state, the chief minister informed Shah and requested that the third cadre review be conducted in 2026 as per the schedule.

Reddy explained that Telangana, like the rest of the country, is facing several modern challenges, including cybercrime, drug trafficking, white-collar crimes, and other emerging security threats.

He highlighted the reorganisation of the Hyderabad, Cyberabad, and Malkajgiri Police Commissionerates, the proposed formation of the Future City Commissionerate and the rapidly growing population in Hyderabad to underline the increasing administrative requirements of the state.