Broken Software
Post about all the ways the software you use is broken.
I hate when there is infinite scrolling, and the site puts important links on the bottom. You have to hold down the "end" key to see them, while the page churns with tons of requests as you look through the links.
Web design is really shit today. It's always been shit, but now it's responsive shit.
Pagination is still compatible with infinite scrolling, in fact it is probably already loaded in pages, they are just displayed together. Restoring current position is a bit more complicated than with separately displayed pages but still possible (though probably not when fully reloading page? IDK how it works on web).
You are right that social media want to show you "new" stuff and thus deliberately don't remember scroll position. However there are technical challenges here too. How do you reliably implement pagination if the order of posts can change at any moment or new posts can be added or removed in the middle of the list (which happens when they are sorted by score, or using some other more sophisticated algorithm)? You can save only the "current" post's id, but then after restoring position the posts around it would be different because the algorithm had reodered them. The only way it can work as you expect is when there is no algorithm at all and posts are always sorted by submission time.