You can't even EDIT THEM (seriously) let alone order them in folders or pin them etc. Open, edit or share, that's it, and the last of which I think perhaps three people have ever done, and only by accident.
But there is another way to organize bookmarks like one would expect.
_shameless plug_
You can use Websktop webapp for this. That way you'll have a fully customizable grid of bookmarks. It could look like this:
(I noticed adding to a folder appends, and for a while was carefully shuffling between folders to sort, then realized they'd given up on bookmarks so I should too.)