I’ve been following BlueSky closely for a while and I’ll just add a few points here:
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There is currently a federation sandbox for developers, it’s definitely on the way but it is a significantly different model than AP. Severs are really “dumb” and it has an emphasis on using a handful of services to crawl the network and generate a pipeline of all posts.
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Moderation and custom algorithms are also a part of the decentralized model. Custom algorithms are out now, and custom moderation services are also under development.
Having played with both AP and ATP a fair amount they definitely both have strengths and weaknesses, very different approaches to decentralized social networking.
I forget the author, but The Immortal Game is both. It discusses chess history, but also tells the story of a famous game that took place in a pub after hours during a major chess tournament. Probably a little more on the informative side but I really liked it.