Good read! Aligns a lot with everything happening with the IndieWeb community[1] (including social readers[2]) and what I'm working on with Haven[3]. The additional piece (I know, more parts make everything harder for everyone) is using these tools for _private_ sharing. That's been my focus--publishing RSS with http basic auth for access control--while keeping subscribing as simple as copy/pasting a URL or using a browser extension that recognizes RSS auto-discovery[4].
[2]: https://indieweb.org/social_reader
[3]: https://havenweb.org