[Nathan2055]

This is why I believe that Bluesky and the AT protocol is a significantly more attractive system than Mastodon and ActivityPub. Frankly, we’ve tried the kind of system ActivityPub offers before: a decentralized server network ultimately forming one big system, and the same problems have inevitably popped up every time.

XMPP tried to do it for chat. All the big players adopted it and then either realized that the protocol wasn’t complex enough for the features they wanted to offer or that it was much better financially to invest in a closed system. Sometimes both. The big providers split off into their own systems (remember, Google Talk/Hangouts/Chat and Apple iChat/FaceTime both started out as XMPP front-ends) and the dream of interconnected IMing mostly died.

RSS tried to do it for blogs. Everyone adopted it at first, but eventually content creators came to the realization that you can’t really monetize sending out full-text posts directly in any useful way without a click back to the originating site (mostly defeating the purpose), content aggregators realized that offering people the option to use any front-end they wanted meant that they couldn’t force profitable algorithmic sorts and platform lock-in, and users overwhelmingly wanted social features integrated into their link aggregators (which Google Reader was famously on the cusp of implementing before corporate opted to kill it in favor of pushing people to Google+; that could have potentially led to a very different Internet today if it had been allowed to release). The only big non-enthusiast use of RSS that survives is podcasts, and even those are slowly moving toward proprietary front-ends like Spotify.

Even all the way back to pre-Web protocols: IRC was originally a big network of networks where every server could talk to every other server. As the system grew, spam and other problems began to proliferate, and eventually almost all the big servers made the decision to close off into their own internal networks. Now the multi-server architecture of IRC is pretty much only used for load balancing.

But there’s two decentralized systems that have survived unscathed: the World Wide Web over HTTP and email over SMTP. Why those two? I believe that it’s because those systems are based on federated identities rather than federated networks.

If you have a domain name, you can move the website attached to it to any publicly routable server and it still works. Nobody visiting the website even sees a difference, and nobody linking to your website has to update anything to stay “connected” to your new server. The DNS and URL systems just work and everyone just locates you automatically. The same thing with email: if you switch providers on a domain you control, all the mail still keeps being routed to you. You don’t have to notify anyone that anything has changed on your end, and you still have the same well-known name after the transition.

Bluesky’s killer feature is the idea of portable identities for social media. The whole thing just ties back to a domain name: either one that you own or a subdomain you get assigned from a provider. That means that picking a server isn’t something the average person needs to worry about, you can just use the default and easily change later if you want to and your entire identity just moves with you.

If the server you’re on evaporates, the worst thing that you lose is your activity, and that’s only if you don’t maintain any backups somewhere else. For most people, you can just point your identity at a different server, upload a backup of your old data, and your followers don’t even know anything has changed. A sufficiently advanced client could probably even automate all of the above steps and move your whole identity elsewhere in one click.

Since the base-level object is now a user identity rather than a server, almost all of the problems with ActivityPub’s federation model go away. You don’t deal with blocking bad servers, you just block bad people (optionally using the same sorts of “giant list” mechanisms already available for places like Twitter). You don’t have to deal with your server operator getting themself blacklisted from the rest of the network. You don’t have to deal with your server operator declaring war on some other server operator and suddenly cutting you off from a third of your followers.

People just publish their posts to a server of their choice, others can fetch those posts from their server, the server in question can be moved wherever without affecting anything for those other users, and all of the front-end elements like feed algorithms, post display, following lists and block lists, and user interface options could either be handled on the client-side or by your choice of (transferable) server operator. Storage and bandwidth costs for text and (reasonable) images are mostly negligible at scale, and advertising in clients, subscription fees, and/or offering ancillary services like domain registration could easily pay for everything.

ActivityPub sounds great to nerds who understand all of this stuff. But it’s too complicated for the average social media user to use, and too volatile for large-scale adoption to take off.

AT protocol is just as straightforward to understand as email (“link a website domain if you already have one or just register for a free one on the homepage, and you can easily change in the future”), doesn’t require any special knowledge to utilize, and actually separates someone’s identity and content from the person running the server. Mastodon is 100 tiny Twitters that are somewhat connected together, AT actually lets everyone have their own personal Twitter and connect them all together in a way that most people won’t even notice.

[ChrisArchitect]

Good post of historical reminders and I appreciate the framing of bluesky's identity approach. Never was sold on Fediverse/ActivityPub as being it and not a fan yet of Bluesky's slow-building-in-public approach but am intrigued by this key facet of the main role the personal domain takes. How can one easily change/migrate their AT identity if they change domains? How is their whole social history transferrable? Like that was one of the problems/unclear things to most about Mastodon - that it actually wasn't that easy to move instances because sure your identity could move but your posts would be on the old instance, so it wasn't really that portable. I'm all about the permanence and data preservation, so I don't want to commit to a platform now without assured control over my data and ability to maintain history/identity in a move. Have enjoyed the centralization and longevity for too long on a place like Twitter to get all loose and ephemeral now.

[steveklabnik]

To change domains, you:

Go into settings, click change handle.

Type in the domain you wish to change to. Click next.

It’ll give you some stuff to put into a DNS TXT entry on that domain. Do that. Click “verify DNS record.”

And that’s it. You’re done. Everything is “transferred.”

The history is transferable for the same reason a domain is transferable to another web host: what does URL stand for again? Uniform resource locator? That is, it’s how you locate something, not what that something is. In this case, the domain isn’t actually your identity: your identity is your DID, “decentralized identifier.” To hand wave slightly, all your content is signed with your DID information, not the URL you use. There’s a service that resolves domains to DIDs. So changing your domain means changing what that service resolves to. That’s why I put “transferred” in quotes above; when changing domains, nothing actually moves.

Now, if you want to change the server where your data is hosted, your PDS, it’s effectively the same thing: you spin up a new server, backfill your data by a backup or by replaying it from the network, and then say “hey here’s a new PDS” to the network.

All of this is possible because of the fundamental design choices atproto makes over the ones ActivityPub does.

Happy to answer more questions. But if data ownership and preservation is a thing for you, you should like atproto.