New Delhi: Private data of over 5.6 lakh Indian Facebook users was compromised by a private marketing firm that later sold the personal details acquired through a quiz app to Cambridge Analytica, a UK-based company at the centre of a global privacy breach storm.

The social media giant informed the Indian government on Thursday about the details of compromised accounts in response to a notice over the user data breach and details of the steps Facebook was taking to ensure safety and prevent misuse of personal data.

A Facebook spokesperson, sharing the response with IANS, said a possible breach of data of 562,455 users happened after 335 Facebook users in India installed a quiz app, "thisisyourdigitallife" between November 2013 and December 2015.

The app, developed by University of Cambridge psychology researcher Aleksandr Kogan and his company Global Science Research, pulled out data of not only these 335 users but their friends as well as friends of friends also.

Some 335 people in India were said to have installed the app, which is 0.1 per cent of its total worldwide installs. But this information is limited to people who installed the app throughout its lifetime on the Facebook platform -- from 2013 to December 2015 -- when it was suspended from the platform.

The social media giant, however, did not reveal the identity or locations of these 335 users.

From Monday, Facebook will inform all 562,455 users that their account privacy had been breached through a link at the top of their news feed so they can see what apps they use and the information they have shared with those apps.

Facebook also doesn't know how Cambridge Analytica and Global Science Research used the data of Indian users because the firms are not its downstream affiliates and may have made independent decisions regarding the data they obtained. This, Facebook said, was "not authorize(d) and breached our policies".

Ankush Johar, Director at Infosec Ventures -- security solutions firm – said, "The quiz app 'thisisyourdigitallife' is not the only application that had hidden data-scraping functionalities and many other apps were exploiting these so-called 'features' provided by Facebook which the company confirmed itself.

"If as small as 350 users in a single app can lead to leakage of over 5 lakh users, the true number can be exponentially bigger than this," Johar added.

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United Nations (PTI): India has called on the international community to act together against ISIS and Al Qaeda and their proxies, underlining that terrorism is an “existential threat” to international peace and security.

“Terrorism is an existential threat to international peace and security. It knows no borders, nationality, or race, and is a challenge that the international community must combat collectively,” First Secretary in the Permanent Mission of India to the UN Raghoo Puri said on Wednesday.

In remarks to the United Nations Office of Counter-Terrorism (UNOCT) annual ambassadorial level briefing to Member States, Puri recalled the April 2025 terror attack in Jammu and Kashmir’s Pahalgam, carried out by The Resistance Front, a proxy of Pakistan-based Lashkar-e-Taiba, a UN listed terror organisation. The terror attack led to the loss of lives of 26 tourists.

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“We must act together against ISIS and Al Qaeda and their proxies,” he said, adding that as a country which itself has been a victim of cross-border terrorism for the past nearly three decades, “India is acutely aware of the socio-economic and human cost of terrorism, especially for its victims.”

India added its voice in stressing on the importance of the Global Counter Terrorism Strategy (GCTS) as a central instrument for multilateral cooperation.

Puri said India will remain steadfast and engaged in the consultations for the 9th review of the GCTS, assuring full cooperation to co-facilitators Finland and Morocco during negotiations in the process.

Puri also highlighted that as Chair of the Counter Terrorism Committee in 2022, India has striven to bring these principles into the counter-terrorism architecture of the UN and into the debate on terrorism at the United Nations.

“Our follow up initiatives both in New York and around the world stand testimony to our commitment,” including the ‘Delhi Declaration’ - a landmark document to deal with the issue of countering the use of new and emerging technologies for terrorist purposes, an issue Puri said is of acute importance for several Member States.

In October 2022, the Security Council Counter-Terrorism Committee (CTC), chaired by India that year, had organised a special meeting in New Delhi and Mumbai on the overarching theme of ‘Countering the use of new and emerging technologies for terrorist purposes’.

As an outcome of the special meeting, the committee had adopted the ‘Delhi Declaration’ on countering the use of new and emerging technologies for terrorist purposes.

India continues to work closely with the UN via its various entities to build capacity and make its partners future ready to take on the ever-evolving scourge of terrorism, he said.