Is it possible to have 'privacy-first' and to share notes with others or even publish them?

It would be nice to discover people who have notes with the same keywords or who have annotated the same sentences in an article.

Medium offers some of that but it's only on medium articles, and it's not possible to intersect annotations and notes. E.g. how could I find people who have an 80% overlap of interest in a set of articles that I have curated on some topic?