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I came in thinking it was P(rogrammable) L(ogic) C(ontroller), but this is something I've never seen before. Is there anyone who could explain this PLC to me?

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It's core to the AT Protocol method of opening up social feeds. Some introductory blog posts that helped me:

https://overreacted.io/open-social/

https://overreacted.io/where-its-at/

https://overreacted.io/a-social-filesystem/

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