Facebook Inc has said that personal information of as many as 87 million people, most of them in the US, may have been improperly shared with data firm Cambridge Analytica.
This is Facebook’s first official confirmation of the possible scope of the data leak, which was previously estimated in news reports. About 270,000 people downloaded a personality quiz app and shared information about themselves and their friends with a researcher, who then passed along the information to Cambridge Analytica, in a move that Facebook says, was against its rules.
The 87 million figure is much higher than the 50 million people estimated in earlier reports. Facebook made the new disclosure in an online posting. Facebook said it will tell people, in a notice at the top of their news feeds starting April 9, if their information may have been improperly shared with Cambridge Analytica.
The company has been embroiled in controversy for weeks over the revelation that data was shared and then not deleted. It raised questions over the reams of data Facebook compiles on users, makes available to third parties, and what happens to it afterward.
Among changes: Facebook has added a section explaining that it collects people’s contact information if they choose to “upload, sync or import” this to the service. This may include users’ address books on their phones, as well as their call logs and text histories. The new policy says Facebook may use this data to help “you and others find people you may know.” The previous policy did not mention call logs or text histories.