If you don't know it, take a look at Shaarli[1], it's a bookmarking web app that allows you to share your bookmarks via RSS, you can add tags and comments, but you can also have "notes" without a link that can be used as microblogging posts.

It's a project from Sebsauvage[2] (an old school french blogger), who wanted to build a social network around the RSS technology.

I know there are projects around it to aggregate multiple shaarli and use it as an actual social network based around sharing links with RSS. I didn't search about it, but it seems that shaarlo[3] is one of them. EDIT: actually, projects like this are listed in shaarli's documentation[4].

EDIT2: tt-rss-shaarli seems to be what you want, Tiny-Tiny RSS with Shaarli, an aggregator with a sharing/commenting functionality.

[1] https://github.com/shaarli/Shaarli

[2] http://sebsauvage.net/wiki/doku.php?id=php:shaarli

[3] https://github.com/DMeloni/shaarlo

[4] https://shaarli.readthedocs.io/en/master/Community-&-Related...