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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Ahmedabad, Apr 25: The Gujarat Congress on Friday suspended from the party for six years its Surat Lok Sabha candidate Nilesh Kumbhani, whose nomination form was rejected over discrepancies leading to the BJP's Mukesh Dalal getting elected unopposed.

A statement from the Congress said the party's disciplinary committee decided to suspend Kumbhani after thorough discussion, adding it had come to the conclusion that the nomination form was rejected due to gross negligence on his part or "in connivance with the BJP".

"To be fair to you we have given time to you to explain your case but instead of coming before the party disciplinary committee you have gone incommunicado. After your form was rejected by the authorities, BJP went ahead and got form of other eight candidates withdrawn. This has deprived people of Surat their voting rights," the Congress disciplinary committee headed by Balu Patel said.

"People of Surat and party workers have become very angry due to your action and are expressing their anger in different ways. The Congress party has decided to suspend you for six years from the party," the press note said.

Kumbhani's nomination form was rejected on April 21 after his three proposers submitted affidavits to the district returning officer claiming the signatures on the document was not theirs.

The nomination form of Suresh Padsala, the Congress' substitute candidate from Surat, was also invalidated on the same grounds.

In his order, Returning Officer Sourabh Pardhi said the three nomination forms submitted by Kumbhani and Padsala were rejected after prima facie discrepancy was found in the signatures of the proposers and they did not appear to be genuine.

Kumbhani, a former corporator from Surat, had unsuccessfully fought the 2022 Assembly polls from Kamrej there.

The Bharatiya Janata Party's Mukesh Dalal was elected unopposed from Surat Lok Sabha constituency on April 22 after all other nominees, including one from BSP, withdrew from the fray one by one on the last day of withdrawing papers.