Here's one thread on Lobste.rs - triggered by a new story about that thing from December last year where an ad sales team at Cox Media Group were caught lying to their customers about having "active listening" technology that targeted ads based on recorded audio: https://lobste.rs/s/mf7guc/leak_facebook_partner_brags_about
Here's the ad sales pitch deck in question - my "this is a total scam" antenna were vibrating like crazy when I read it https://www.documentcloud.org/documents/25051283-cmg-pitch-deck-on-voice-data-advertising-active-listening