Imagine if ABC/CBS/NBC actively went to political parties and sold them on buying their way into the scripts of the top prime-time sitcoms to shape the opinion of viewers. That's essentially what Facebook is doing out in the open.
https://medium.com/insurge-intelligence/exclusive-documents-...
I wasn't quite aware of this myself until a few years ago. Now I see it in almost every crime/spy/military-related show or movie. I've stopped watching several shows because of it and never started watching others.