Yes. I imagine, we would have hashtags, and algorithmic hashtags (in case your uncle stops using #rightWingConsiracy hashtab because everybody is filtering it?

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).