Facebook says it will begin informing users as to whether their personal data may have been wrongly shared with a British research company.
Beginning Monday, Facebook said users who may have had private data shared with Cambridge Analytica will receive a message about it in their News Feed.
The company believes up to 87 million people might be have been affected. Facebook says most of them are in the United States. It says there were about a million users affected each in the Philippines, Indonesia and Britain.
Facebook says the information Cambridge Analytica got was first collected by a researcher at Cambridge University. The researcher gathered the data in 2013 through an
app
that asked users a series of questions for what was described as a
personality
test.
The users used Facebook to sign into the app. Facebook says information may have also been shared on people who did not sign into the app, if they were Facebook friends with users who did.
Last week, Facebook founder Mark Zuckerberg admitted the company made mistakes in dealing with Cambridge Analytica. The company says it is continuing to investigate the incident. Zuckerberg apologized and said the social media service is already taking steps to prevent misuse of user data in the future.
Facebook has also created a link that shows all users what apps and websites they used Facebook to sign into. From the link, users can remove ones they no longer want connected to Facebook.
Cambridge Analytica uses a research method that involves "psychographs." The method aims to use data it collects to predict personal behaviors.
Cambridge Analytica data was used during the 2016 U.S. presidential election. The company worked for then-candidate Donald Trump. A Trump campaign official has said the campaign did not use Cambridge Analytica for voter information.
