Not exactly CMS, but I'm working on a browser extension along a similar line of thought. It unifies all bookmarks/notes/chat messages etc you have for a certail URL treating them as first-class: https://github.com/karlicoss/promnesia#demo
P.S. It's also relevant to bookmark management as well: you get to see not only notes on the bookmark, but also on the 'child' URLs, e.g. if you open someone's twitter profile you'd be able to see their tweets you've favorited. Or if you open some blog, you'd see posts from that blog you saved on Reddit.
P.S. It's also relevant to bookmark management as well: you get to see not only notes on the bookmark, but also on the 'child' URLs, e.g. if you open someone's twitter profile you'd be able to see their tweets you've favorited. Or if you open some blog, you'd see posts from that blog you saved on Reddit.