This is the thing that bugs me the most about the feed.

They seem to be very good at categorizing things. After all, it's the foundation of their entire business model: placing people into a giant ontology of subjects and then selling access to that ontology to advertisers.

It's hard for me to believe that they can't notice that I basically hide every single political post no matter the subject that appears on my timeline. You'd think it would be easy for them to de-prioritize these and it would make the whole experience more appealing.

But, what about when he posts pics of the cousin's kids wearing T-shirts he bought them containing propaganda slogans? :-)

Yes. I imagine, we would have hashtags, and algorithmic hashtags (in case your uncle stops using #rightWingConsiracy hashtab because everybody is filtering it?) and ability to filter by hashtags (with ability to selectively pick whether you block algorithmic hashtags, or normal hashtags). The problem I see is that your uncle might get offended that FB is marking his posts #rightWingConspiracy).