back in 2010-ish we had social bookmarks like delicio.us, which was actually pretty cool and useful, I still wonder if a kind of search engine could be built on

back in 2010-ish we had social bookmarks like delicio.us, which was actually pretty cool and useful, I still wonder if a kind of search engine could be built on top of that kind of thing, basically a recommendation system for websites weighted more for quality than search term matching.