I’ve signed an agreement to write a book about ActivityPub for O’Reilly Media. ActivityPub is the protocol for connecting social networks across the Web; it’s what currently underpins Mastodon and will be used by Threads.net. The book should be available sometime after summer 2024.
The book will be a developer guide that will help programmers connect existing software to the social web, as well as making brand new social applications. Currently, developers depend on reading the specifications themselves, forum posts, wiki pages, blog posts, and other content spread across the Web. I hope that a single book with practical step-by-step information will make learning about and building with ActivityPub easier.
O’Reilly is the best programming book publisher, hands down. I have a dozen O’Reilly titles on my shelf, all with the famous engraved animal covers, and I use them regularly. I appreciate that the O’Reilly team sees the potential for an ActivityPub book. I have had a great experience with the editors so far.
I’ll update my progress here. I have a pretty tight schedule, but I’ve rearranged some of my commitments like graduate school to accommodate the work. (I’ll be getting credits from Georgia Tech towards my CS degree for doing this book — a nice bonus!) This is the first book I’ve written, and it’s going to require working code for examples, so there will be a lot of learning and work to do. But I’m confident this will be a step forward.
Evan Prodromou's Blog 
This is awesome! O’Reilly is the one publisher whose books I’m willing to blindly buy and assume they’re good. And having to wade through all the specs and forum posts is what is deterring me from making my own ActivityPub software, so a step-by-step guide is really going to help!
@evanprodromou I’m resharing this because it appeared in my Mastodon app. It looks good in this format!
@evanprodromou Congratulations!
@evanprodromou @timoreilly will you be joining in?