San Francisco, Sep 28: Facebook has admitted that the phone numbers that its users provide for security purposes are being used to target them with ads, the media reported.

"We use the information people provide to offer a better, more personalised experience on Facebook, including ads," a Facebook spokesperson was quoted as saying by TechCrunch on Thursday.

The social network specifically uses a phone number that users provide for two factor authentication (2FA) -- a security technique that provide a second layer of authentication to help keep accounts secure, the report added.

"We are clear about how we use the information we collect, including the contact information that people upload or add to their own accounts. You can manage and delete the contact information you've uploaded at any time," the Facebook spokesperson said.

Facebook confirmed the use of users' phone number for targeting ads after Gizmodo reported research work carried out by academics at two US universities who found that the social network uses pieces of personal information that individuals did not explicitly provide it to target them with ads.

Besides using the contact information users willingly provide to Facebook, it is also using contact information they handed over for security purposes and contact information they did not hand over at all, but that was collected from other people's contact books, the Gizmodo report said.

The findings of the study suggest that Facebook uses "shadow contact information" to make money through advertising.

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Bengaluru: Vidyaranyapura police have arrested four persons, including a man posing as a Police Sub-Inspector (PSI), for allegedly breaking into a house, threatening the occupants, and extorting money while wearing police uniforms.

The arrested accused have been identified as Mallikarjuna, Pramod, Vinay, and Hrithik.

Police said the accused had hatched a plan to pose as police personnel, conduct fake raids, and extort money from residents by intimidation.

ALSO READ: Bantwal police arrest two men for illegal sale of narcotics, seize two vehicles, 810 gm ganja

According to the police, Mallikarjuna had failed the PSI examination twice and later falsely projected himself as a PSI. He allegedly conducted photo shoots in his hometown, Siraguppa, wearing a police uniform, baton, cap, and shoes, claiming to be serving as a PSI in Bengaluru.

On December 7, the four accused allegedly went to the house of Naveen in the Vidyaranyapura limits, threatened him with a stick and an iron rod, and claimed they had information that he was selling ganja. Under the pretext of searching, they allegedly extorted ₹87,000 through bank transfer, ₹53,000 in cash kept in the house, and ₹2,000 from his wallet.

Following Naveen’s complaint, Vidyaranyapura police registered a case and launched an operation, leading to the arrest of all four accused. Police have seized ₹45,000 in cash and the car used to commit the crime.
Further investigation is underway.