More than 63000 Kiwis potentially impacted by Facebook data breach

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Facebook on Tuesday added a way for people to know when their

Starting today, the 87 million users who might have had their data shared with Cambridge Analytica will get a detailed message on their news feeds.

Facebook has come under fire in recent weeks after it said that the personal information of up to 87 million users, mostly in the United States, may have been improperly shared with political consultancy Cambridge Analytica.

Facebook said most of the affected users are in the USA, though there are over a million each in the Philippines, Indonesia and the UK.

All 2.2 billion users on Facebook will also receive a "Protecting Your Information" notice. It says it engaged a university professor "in good faith" to collect Facebook data in a manner similar to how other third-party app developers have harvested personal information.

Christopher Wylie, the whistleblower who first broke the data scandal claims to have founded AggregateIQ while working for Cambridge Analytica. Wylie said that AggregateIQ received payment from a pro-Brexit campaign group before the 2016 referendum when Britain voted to leave the EU.

That Facebook app, called "This is Your Digital Life", was a personality quiz created in 2014 by an academic researcher named Aleksander Kogan, who paid about 270,000 people to take it.

Following the breach, Facebook apologised and experienced public outcry and lowered stock prices, calling the way that Cambridge Analytica collected the data "inappropriate".

The app vacuumed up not just the data of the people who took it, but also - thanks to Facebook's loose restrictions - data from their friends, too, including details that they hadn't meant to share publicly.

Once you've clicked the "Settings" tab, go to "Apps and Websites" to view which apps you have permitted to access your information. "If they refuse or fail our audit, their apps will be banned from Facebook", Ime Archibong, Facebook vice president of product partnerships said, thanking CNBC for leading them to the discovery of said data firm. This link will help users shut off information sharing to these apps or shut down information sharing to all additional apps completely.

When asked if he thought Facebook was even able to calculate the number of users affected, Wylie stressed that data can be copied once it leaves a database.

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