I use Wallabag every day, but I don't think I posted about it yet. (I'm a bookmark hoarder.)
Wallabag makes it convenient to bookmark and tag web content on multiple devices and browsers, can be used to keep track of reading and integrates nicely with RSS readers. The backend can be set up on your own server, but there's also an affordable paid hosting option for those who prefer that.
Follow friends and discover new ones. Publish anything you want: links, pictures, text, video. This server is run by the main developers of the Mastodon project. Everyone is welcome as long as you follow our code of conduct!