Chris Webber, one of ActivityPub's creators, suggests next steps in "OcapPub: Towards networks of consent" https://gitlab.com/spritely/ocappub/blob/master/README.org
Chris and I gave keynotes at ActivityPub 2019:
"ActivityPub: past, present, future" by Chris https://www.youtube.com/watch?v=Tgq0lqZ1Mvw
"Architectures of Open Robustness" by me https://www.youtube.com/watch?v=NAfjEnu6R2g&list=PLzDw4TTug5...