I would pay $1/mo for a chronological feed of my friends' updates and posts.
I found Twitter and Facebook to be frustratingly unusable after they removed their chronological feeds in favor of feeds that prioritize ads and engagement.
Isn't Twitter properly chronological with 'Latest Tweets' turned on? For a while that setting would frequently reset to the non-chronological default, but at the moment it seems to be sticky. (I mostly use Twitter in a web browser, but I think the Android app is working the same way.)
I found Twitter and Facebook to be frustratingly unusable after they removed their chronological feeds in favor of feeds that prioritize ads and engagement.