https://www.vox.com/2018/3/20/17138756/facebook-data-breach-cambridge-analytica-explained

Facebook expected its user data to be harvested. It just didn’t expect Cambridge Analytica to do it 50 million times.

Over the weekend, news broke that data firm Cambridge Analytica (CA), a data analytics firm that worked with Donald Trump’s election campaign, had extracted Facebook data from 50 million user accounts. Or, more accurately, we might say that “news” “broke.”