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You don't have to listen to me, but:
Just a reminder that on the fediverse and on the ATmosphere to be careful about public comments that could be interpreted as a call to violence. Especially given recent events.
Particularly on ATProto, which is designed to be fully public and indexed and certainly is, but also on the fediverse, which is mostly public enough in general too.
I wrote in support of @thisismissem's letter saying that ATProto and ActivityPub ecosystems ought to engage kindly and constructively with each other. https://writings.thisismissem.social/statement-on-discourse-about-activitypub-and-at-protocol/
I have explained my thinking more here: https://github.com/swicg/general/pull/45#issuecomment-3263275752
We face a lot of threats, especially ones greater than each other right now. We should challenge each other, but it is worth engaging so in a constructive way.
Me: the future doesn't have domain names. the domain name system is a form of centralization
Also me: *throwing money on the altar of ICANN* please dear gods accept this sacrifice so I can keep these domains, many of which I have never used
hey remember when privacy
Oh is this the new scam
Are we gonna see a million of these a day now
Obviously, this is a phishing attack, but well, maybe it's less obvious to some. If you see a post like this, it's phishing.
I have to say that icon for the "mastodon support desk headset" is kinda funny tho
Maybe you've heard: ActivityPub doesn't just have a server-to-server API, it also has a client-to-server API, which actually is pretty cool because it works almost just like the server-to-server API actually!
But almost nobody implemented client-to-server.
BUT I DID
Even more chaotically, I wrote an EMACS ACTIVITYPUB CLIENT
Again, pretty bare bones. But this is what I used to post to Pubstrate in the first post!
As you can tell from the screenshot, ActivityPub really is just "like email"
But Pubstrate supported the idea of many media types, and even if it encountered a media type it didn't know how to render, it would render as much information as it did know how, and use type inheritence chain as cleverly as it could.
Pubstrate also supported video! So Peertube wasn't the first ActivityPub implementor of video in ActivityPub, I can claim that fame 
But Pubstrate was pretty crude and had no users so, well, maybe I can't
But one of the other things Pubstrate took really seriously was the ActivityStreams type hierarchy. I had gotten involved in ActivityPub standardization because I was working on MediaGoblin and @tsyesika was doing the federation work, and we wanted something that could handle all kinds of media. So here you can see image support.
The generic methods system in pubstrate tried to be very thoughtful about how things would render based off of a generic methods system I built for it.
One of those implementations was called Pubstrate, and it was my main test implementation of things at the time, also written in Guile Scheme. I don't recommend using it; it's spec-compatible, but isn't going to meet all the expectations that have evolved since. But it did work, and you still technically can run it, and I think it had some neat ideas.
Here's the original messages from my test posts. I wrote them with my wife @mlemweb standing behind me, which you can see based on the text 
ActivityPub grew out of Pump.io's Pump API, and then was converted to a spec: see the document for more history about what was involved.
But I was also writing a lot of software to make sure things made sense. Not just the test suite! I also wrote several implmentations. Not only of the server-to-server protocol. Yes, the client-to-server too!
For one thing, you may have heard the ahem "rumor" that the Official ActivityPub Test Suite, which was down for a long time because I am not a great sysadmin, was actually built out of the bones of a multiplayer text adventure game I had written.
AND THOSE RUMORS ARE TRUE!
It was kind of cool software though. It was kind of an interactive questionaire that would interrogate your implementation, and then generate a report that the activitypub.rocks site knew how to read
When activitypub.rocks was made, ActivityPub wasn't even yet a Candidate Recommendation in the W3C process. I talk a bit more in the post about how the spec got to where it was, and the players involved.
But I also included some bonus material, some history few people have seen.
Here it is...
I'm handing https://activitypub.rocks over to the community! And I wrote a post about it https://activitypub.rocks/news/handing-off-activitypubrocks-to-the-activitypub-community.html
I did the original design of activitypub.rocks 9 years ago and I haven't done much to keep it up to date. So the W3C SocialWG is taking over instead!
As a nice sendoff, the blogpost also includes some fun AP history, which I detail a bit in this thread too 🧵