San Francisco: The world's largest social media company Facebook suffered the biggest one-day drop of its stocks by seven per cent on Wall Street on Monday in four years following reported data leakage of its 50 million users for alleged political purposes.

The Facebook loss came after US and British media reported that the data of more than 50 million Facebook users were inappropriately used by a British data analysis company, Cambridge Analytica, in activities allegedly connected with US President Donald Trump during his 2016 campaign.

Trump's campaign reportedly used the firm's data during the primaries but not during the general election and Federal Election Commission numbers showed the firm collected $5.9 million in 2016 from Trump's campaign, Xinhua cited California-based The Mercury News daily as saying.

Cambridge Analytica received user data from a Facebook app years ago that purported to be a psychological research tool, though the firm was not authorised to have that information.

Facebook admitted that an estimated 270,000 people had downloaded the app and shared their personal details with it.

Last Friday, Facebook said in an official post that it had suspended "Strategic Communication Laboratories (SCL), including their political data analytics firm, Cambridge Analytica," from its website.

It said the two companies had failed to delete user data acquired in 2015 in violation of Facebook rules.

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Hazaribag (PTI): The situation in Jharkhand’s Hazaribag district remained peaceful on Monday, a day after tension gripped a village following an alleged stone-pelting incident during a religious procession, a senior police officer said.

Barhi subdivisional police officer (SDPO) Ajit Kumar Bimal told PTI that the situation in Jhurjhuri village was brought under control within a few hours of the incident on Sunday evening.

"All shops, markets and business establishments remained open and traffic was normal," he said.

Asked about arrests, Bimal said the process of identifying those involved was underway, and an FIR had been lodged in connection with the incident.

The incident occurred around 8 pm on Sunday, when stones were allegedly thrown at a religious procession. Security was tightened in the area following the incident.

The group that organised the procession claimed several women were injured in the attack.

In response, the participants blocked a stretch of the GT Road. "The situation is now completely under control," the SDPO added.