When I’ve thought on this previously, I always imagined something similar to what you’re describing here @david-beinn @neo @isntism.
Users collating that data (bookmarks as a rating), and then optionally making that data available for others to use (which, w/ PtP would earn them money). Add in curation / collation (some search service apps) and you could (I imagine), get a more humanised version of search (and as you suggest @david-beinn, your choice of algo etc).
I think there’s a lot of possibilities on SAFE for this. Great to see more folk thinking around it!