Facebook Data Collected by Cambridge Analytica Included Private Messages

Facebook has said that political data firm Cambridge Analytica improperly harvested the public profile data of up to 87 million of its users, including their political beliefs, interests and friends’ information. Now the company has revealed that the extent of the harvesting went even further — it included people’s private messages, too.

On April 9, Facebook began informing people whose data may have been compromised by Cambridge Analytica through an app developed by the researcher Aleksandr Kogan. In its notifications, Facebook said that while the information harvested was largely limited to what was on people’s public profiles, “a small number of people” also shared information from their Facebook timeline, posts and messages. Facebook did not specify how many people’s messages were gathered and said it was taking as broad a view as possible when notifying people that their data may have been taken.