In this panel, Christopher Lemmer Webber discusses ActivityPub's server-to-client and server-to-server protocols, and how they could be used to allow people to use a single account to log in to many Fediverse clients. This seems like an immensely useful feature, that could offer enough ease of use to entice people to join the Fediverse. Are there projects working on this?

Relevant discussion starts at minute 24:00:
https://archive.fosdem.org/2019/schedule/event/activitypub_panel/
#fediverse #foss #activitypub