This is starting to feel like a bookmarks app now! Only one big feature left before its actually an MVP — drag-and-drop. I'm feeling it'll be the hardest thing to do nicely whilst trying to stay-web & HTML-foccussed.
Note
A screen recording of a web app with two workspaces with lists of bookmarks in them. The first has a folder called social that is opened and a bookmark is added within that folder.