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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Bhopal, Dec 28: A 10-year-old boy fell into an open borewell in Madhya Pradesh's Guna district on Saturday evening and a rescue operation was underway, officials said.

The incident took place in Raghogarh area.

Sumit Meena, the boy, slipped into the open shaft of the borewell at Pipliya village, about 50 km from Guna district headquarters, about 5 pm.

He was trapped at a depth of around 39 feet, Raghogarh Congress MLA Jaivardhan Singh told PTI from the spot.

A parallel pit has been dug to rescue him, he said.

While police started the rescue operation immediately, a team of the National Disaster Response Force (NDRF) had also arrived from Bhopal, the MLA said.

Oxygen was being pumped into the borewell, he said.