Sorry, was reading multiple articles on this topic at once. Yes this is a newsroom post, however they plan to let individual users know via their newsfeeds: https://www.bloomberg.com/news/articles/2018-04-04/facebook-... "Facebook says 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."
> App Controls: Finally, starting on Monday, April 9, we’ll show people a link at the top of their News Feed so they can see what apps they use — and the information they have shared with those apps. People will also be able to remove apps that they no longer want. As part of this process we will also tell people if their information may have been improperly shared with Cambridge Analytica.