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.

It's not the most used function because browsers already have a 'favorite' function, bookmarks. I used a scrapbook extension in FireFox for years so even though I know it existed I've never used it. But this post actually serves to shine some light on it and I'll give it a shot for a few weeks to see how well it works for me. HN has some amazing threads every now and then and it is really worth remembering those.

Same here. Been here since the first week of HN, just learned about favorites.