I finished two more chapters this week in my book about ActivityPub. Chapter 2 is about Activity Streams 2.0, the social network data standard we use for ActivityPub. Appendix 1 is a reference for all the types in Activity Streams.
Next up is Chapter 4, federation protocol, and Chapter 5, extensions. I’m on a tight schedule for both.
First, though, I have to go over edits for the first 4 chapters so they can go out on the Early Release program. Can’t wait to get the text in front of real readers and start getting feedback.
Evan Prodromou's Blog 
@evanprodromou Really cool to see this in "real time" thank you for your work!
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@evanprodromou Woot! Go go Evan. Looking forward to reading. 😎
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@evanprodromou Not sure if this helps with motivation any, but I’m a guaranteed purchase when this book comes out.
Excellent choice going with O’Reilly, too. So much of my learning experience as a developer — going back into the ‘90s — involved their titles.
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@evanprodromou excellent! Looking forward to it!
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@evanprodromou That’s great! Especially that the standard document is a crazy maze. My major issue it’s often difficult to find how to implement a minimal part without having to understand minor details not so important for a basic implementation.
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Specification is not documentation. Thanks for the encouragement.
@evanprodromou How does one get on the Early Release program?
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You have to be using the O’Reilly Learning Platform.