Postmarks

https://sharepostmarks.org

You can read more about Postmarks in its announcement post on my blog:

Postmarks aims to provide a few different functions. Those functions are:

1. Tag-indexed bookmarking
2. ActivityPub publishing (soon to be optional!)
3. Simple commenting, also powered by ActivityPub (also optional)

It's inspired by a number of websites I've loved over the years, including del.icio.us, Google Reader, and Branch.

You can also read coverage of its launch on TechCrunch, an interview with me on the Glitch blog, or the transcript of my FOSDEM 2025 Talk Non-Microblogging Software Design on ActivityPub.