Tags, because a link is rarely about one thing
Folders make you answer a question with no good answer: is this article about Rails, or about performance, or about databases? It is about all three, and a folder makes you pick one and then forget which you picked. Tags let you say all three and move on.
Anyone who has ever stalled deciding which folder a bookmark belongs in
Get started
Free, and your tag list builds itself as you go.
No taxonomy to design first
There is nothing to set up. Type tags into the field as you save, separated by spaces, and they are created as you use them. Your existing tags appear as suggestions under the field so you reuse rails rather than accumulating rails, ruby-on-rails and rors.
Every tag is a page
Each tag has its own URL listing everything under it, newest first, and your tag list is ordered by how much you actually use each one — which turns out to be a fairly honest picture of what you have been reading this year. Tags with nothing left in them disappear on their own.
Tags are yours alone
Your tags are scoped to your account. Counts, suggestions and tag pages only ever reflect your own bookmarks, and a tag you use only on private links never shows up on your public page.
Questions
How many tags can one bookmark have?
Up to twenty-five, which in practice nobody reaches. Two or three is usually the sweet spot.
Can I rename or merge tags?
Not in bulk yet. You can retag individual bookmarks from the edit form, and a tag with no bookmarks left stops appearing anywhere.
Do tags have to be single words?
Yes — tags are separated by spaces, so use a dash or a dot for multi-word tags, like machine-learning or node.js.