Pretty much what the title says, I've only seen a "general" bookmark option for posts (either it is bookmarked or it isn't) but even in my own bookmarks I don't seem to be able to group them in a way that might be useful i.e, can't separate "Things I want to have saved somewhere because they are really good/insightful" from "Things I want to read in more depth at a later date". There are more categories in which this might be handy, but these two seem pretty natural. Is there some way to do this I'm not seeing?