circles were for sharing and reading. you organized people in a circle and when you shared content, you shared to that circle so they only saw that content. we have half of that functionality with a list or a follow pack. you can read from that list or follow pack, but you can't specifically share to it.

but as i said in another content, human curated lists are hard. i think algos handle it better than we ever could.

i.e. maybe i have a cool hiking pick that i wanna share to my hiking group, but you're in my bitcoin group, false, so you won't see it, even though you may like to see that pic.