Post Syndicated from original https://lwn.net/Articles/918224/

ActivityPub-enabled microblogs are gaining
popularity as a replacement for Twitter, but ActivityPub is for more than
just microblogging. Many other popular services also have open-source
alternatives that speak ActivityPub. Proprietary services operated by
commercial interests usually deliberately limit interoperability, but users
of any ActivityPub-enabled service should be able to communicate with each
other, even if they are using different services. This promise of
interoperability is often limited in practice, though; while ActivityPub
specifies how multiple types of content
can be published, the kinds of content that can be
displayed or interacted with vary from project to project.