This is an informal guide to help new implementers get up to speed with the ActivityPub specification (published as a W3C Recommendation) and how to build projects with ActivityPub support. ℹ   Note: This is a Wiki Post that anyone can edit. Please help improve and extend this document ! Why choose ActivityPub? Why might you choose to implement ActivityPub in your project? Possible reasons include: “to move beyond the silos of social media sites run by individual comp...