My three favorite blog posts giving a critical perspective of #activitypub:

1️⃣ "ActivityPub: The “Worse Is Better” Approach to Federated Social Networking" by @ariadne@treehouse.systems https://ariadne.space/2019/01/07/activitypub-the-worse-is-better-approach-to-federated-social-networking/ (technical problems)

2️⃣ "On standards divisions and collaboration (or: Why can't the decentralized social web people just get along?)" by @cwebber http://dustycloud.org/blog/on-standards-divisions-collaboration/ (human problems)

and the best 3️⃣🏆 "ActivityPub - Final thoughts, one year later" by Dennis Schubert https://overengineer.dev/blog/2019/01/13/activitypub-final-thoughts-one-year-later.html (UX)