Last week a bombshell report from the New York Times alleged that the British data analysis firm Cambridge Analytica gleaned information from roughly 50 million Facebook users without their permission or knowledge. To top that off, the firm collected enough information from 30 million users to match to other personal accounts, as well as build potential fictional accounts.
For context, Cambridge Analytica has close ties to President Donald Trump's 2016 campaign, causing many to draw connections between the rise of Trump and this breach of information.
The personal data itself was collected through an online personality quiz created in 2013 by Aleksandr Kogan, who then shared the results with Cambridge Anaylytica. According to Zuckerberg, when Facebook became aware of this information breach in 2015, "We immediately banned Kogan's app from our platform, and demanded that Kogan and Cambridge Analytica formally certify that they had deleted all improperly acquired data."