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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New Delhi (PTI): Three members of a family were found dead inside their home in southeast Delhi's Kalkaji on Friday, with police suspecting it to be a case of suicide, officials said.

Police said the incident came to light around 2.47 pm when a police team reached the premises to execute a court order related to possession of the property. When repeated knocks went unanswered, the staff used a duplicate key to open the door.

Inside, officers found Anuradha Kapoor (52) and her sons, Ashish Kapoor (32) and Chaitanya Kapoor (27), hanging from the ceiling, Deputy Commissioner of Police (Southeast) Hemant Tiwari said in a statement. All three were declared dead.

A handwritten note was recovered from the room, suggesting the family had been struggling with depression.

"The handwritten note indicates emotional distress faced by the family due to which the family may have taken the extreme step," the officer said.

The bodies have been shifted to the All India Institute of Medical Sciences (AIIMS) mortuary for post-mortem and other legal formalities under Section 194 of the Bharatiya Nagarik Suraksha Sanhita (BNSS), police said.

Residents of the neighbourhood said they were shocked to learn about the deaths, adding that the family kept largely to themselves.

Pankaj Kashyap, a resident of Girinagar, said he learnt about the deaths while leaving for work. "I live and work here and was leaving for work when I saw many people standing outside and talking. That is how I got to know that three people had committed suicide. I also saw several police vehicles outside, but I do not know much beyond that," he said.

Baldev, another neighbour, said the family had been living in the newly constructed house for around two years. "We only knew that a mother and her two children lived there. They had moved into the newly built house around two years ago. We did not interact much with them. Today we heard that all three have committed suicide, and whatever we know is based on what people here are saying," he said.

Another neighbour, Ramesh Kumar, claimed the family had earlier attempted suicide.

"About fifteen to twenty days ago, the two sons in the family had attempted suicide and police and ambulances had come. That was when I first got to know who they were. I do not recognise them by face, but we saw the ambulances and police take the two sons that day. Today again we saw ambulances and police arriving, so everyone came out to see what had happened. I do not know how long they had been living here, but this is all we know," he said.

Police said they are examining the family's financial condition, social circumstances, and other factors that may have contributed to the incident. Further investigation is underway.