Facebook patent application (US 20180032883) for "classifiers input information about a user and output a probability that the user belongs to a given socioeconomic group".
Full disclosure: repost of https://news.ycombinator.com/item?id=16315606 (from 70 days ago). Reposted by explicit request of the mods. May now be exceptionally topical in light of the Facebook revelations that have occurred since.
Relevant Twitter thread: https://twitter.com/WolfieChristl/status/960630738256367617
Copy-and-paste friendly version of the patent application, but without images: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=H...
Limited news coverage, e.g., http://expressnewsline.com/2018/02/05/facebook-to-develop-sy...
Full disclosure: repost of https://news.ycombinator.com/item?id=16315606 (from 70 days ago). Reposted by explicit request of the mods. May now be exceptionally topical in light of the Facebook revelations that have occurred since.