It's relatively new. Before we used upvotes. Actually I still don't use it and keep using upvotes to favourite stories. I'm sorry for that and even worse: sometimes I upvote a story without following the link, just using the upvote as a "read later" bookmark because I found the title intriguing. Not so bad is when I upvote because there's a very interesting comment, even though the article itself is crappy.
Time ago someone posted a script that collects upvoted stories, but I can't find it now, it's in one of those upvoted stories O:) I guess I could make a conversion... but there are probably more than a thousand upvoted stories, I don't know.
Actually I still don't use it and keep using upvotes to favourite stories. I'm sorry for that
So do I, but I'm not going to apologize for it. Upvoting is the fastest and more convenient way to save a story as "read later", so it's what I do. If they would add the "favorite" link to the front-page items, I'd use it instead of upvoting.
Time ago someone posted a script that collects upvoted stories, but I can't find it now, it's in one of those upvoted stories O:) I guess I could make a conversion... but there are probably more than a thousand upvoted stories, I don't know.