I use pinboard.in. Works fine for me.

But saving tags--what was called folksonomies at one point--never really became a mainstream way of sharing links as opposed to just bookmarking them for your own use.

At the end of the day, a lot of this is lamenting that a hand-curated Internet doesn't scale.

I miss delicious. The amount of discoverable content that was staggering. Collaborative bookmarking needs to make a comeback.