On several social media sites (including both tumblr and reddit, last I checked) you can press j to scroll down to the next post and k to scroll up to the previous one in your feed. On tumblr you can also press L to like the current post! it would be nice to have these options on cohost as well
A few other things it would be good to have that aren't present on other social media:
Seconded. Posts have been getting long enough we could use this.
seconded, tho as somebody cozy with casual browsing using a mouse exclusively, some of these could also be nice to have not just as hotkeys, but as clickable options too, like a floating/sticky menu that follows the post/browser window.
especially the jumps to different sections of a post and the ability to un-Read More a post without scrolling to the bottom of it, i've had many cases of discovering the rest of the post was waaaay longer than i'd like to scroll by, lol