There's no need. If you upvote the story you can find it again under 'upvoted stories' in your HN profile. That said, pinboard.in is a decent service, and it's

There's no need. If you upvote the story you can find it again under 'upvoted stories' in your HN profile. That said, pinboard.in is a decent service, and it's useful to have all your bookmarks in a central location.