It would be convenient to have the ability to add posts to personal collections or just to bookmarks.
Yeah, almost like Twitter lists but for posts instead of users.
I came to Meta to request something like this - a "watch post" eye button at the bottom. There are posts that I want to read the comments but have nothing to add, and there are posts where I have commented but don't get notifications when there are other comments that aren't replies to mine, so I often miss them.