@dangillmor

Years back, there was some news article about Facebook running an experiment on some users. I don't recall where.

Some users got feel-good content more in their feeds, and sentiment analysis of their content reflected improved mood.

Some users got more depressing feeds and posted content and comments reflecting their own lowered mood.

Searching. here is a reference...

journals.sagepub.com/doi/full/

AI tools make this sort manipulation easier.