One of the bigger news stories of this week is that a firm called Cambridge Analytica obtained data from Facebook, which was then analyzed and sold to politicians for the purposes of making targeted ads. Here's an article about it
Most of what I've read and heard about it suggests that they obtained access to any information which you make available to your friends:
The data, a portion of which was viewed by The New York Times, included details on users’ identities, friend networks and “likes.” The idea was to map personality traits based on what people had liked on Facebook, and then use that information to target audiences with digital ads.
Researchers in 2014 asked users to take a personality survey and download an app, which scraped some private information from their profiles and those of their friends, activity that Facebook permitted at the time and has since banned.
The issue is that when I talk with people about this issue, I want to be doubly sure that "information you share with your friends" is an accurate description of what was harvested. If there was any information harvested that goes beyond that description I would like to be aware of it so that I don't embarrass myself in front of people.
Exactly what information was made available to Cambridge Analytica? More specifically, Is there anything that you might reasonably expect to be private even from your Friends?
I care primarily about users who didn't interact with the app, however including information for those who did would be a bonus.