Say there is a user X on random server Y. Assume that no user on mastodon.social (for example) follows user X. Assume that users on mastodon.social follow other users on server Y. Assume further that neither server has blocked the other.

User X writes a post containing the term, say, #Namibia. The post receives no reply, no boost, no like.

Later, someone searches for #Namibia on mastodon.social. The search results will NOT include user X’s post containing the term #Namibia.

(continues)

Content Warning

A relay may complicate the above picture slightly. But if server Y in the above example is an isolated #GlobalSouth instance, or if it is running software (such as Hubzilla) not based on #ActivityPub, then the relay will most likely not be pulling posts from there, so the example will still hold.

In this context, remember many instances do not add relays because the additional posts pulled in through the relay increase the storage and processing costs.

(continues)

Content Warning

Listen! #Knowledge coming from #museums:
"#ActivityPub is plumbing. It is plumbing built on top of the web, which coordinates the ability for independently operated services, for example a collection of federated social media services, to exchange messages with each other in a decentralized manner.
So #SFOMuseum has built its own ActivityPub server for publishing #socialmedia style messages.
In doing so, it means that we can(& have)created social media accounts for 60,000 objects in our collection including this roll of #HelloKitty toilet paper from #EvaAirlines."
@thisisaaronland
https://www.aaronland.info/weblog/2025/02/13/gummy/#fact2025

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New #introduction time:

👋 Hey, I've been here on the Fedi for the last 7 years.

Founding member of @weareopencoop working at the intersection of #learning, #technology & #community.

Was PM of #MoodleNet, a decentralised digital commons built on #ActivityPub from 2018-2020 which has morphed into @bonfire, a federated app toolkit.

Wrote doctoral thesis on #digitalliteracies. Was on Mozilla's #OpenBadges team & led #WebLiteracy work.

Pursuing MSc in #SystemsThinking

I like 🏔️🥃⚽

Content Warning

@ophiocephalic @FediPact @VeilidNetwork @spritely > This is why it's critical to lend support and solidarity to protocol projects pointing beyond ActivityPub like @spritely and @VeilidNetwork

Oh, are there properly distributed/p2p alternatives to ActivityPub coming up (some kind of spiritual successor to Scuttlebutt?) using those? It's a vulnerability and loss of agency that has been grating on me.

#Veilid#p2p#ActivityPub#Spritely#Goblins#Scuttlebutt

Content Warning

We are seeking a specialized technical consultant to develop a strategic plan for enhancing communication across IBRAM-#Museus’s digital services. The focus will be on interoperability with decentralized social networks (#Fediverse), leveraging the #ActivityPub plugin for #WordPress, which is currently integrated into the #Tainacan platform.
#FediHire#DecentralizedWeb#CulturalHeritage#OpenSource#MuseumTech
https://brasiliana.museus.gov.br/construindo-pontes-dos-museus-para-o-fediverso/

Content Warning

@liaizon @evan @pfefferle @laurenshof @thisisaaronland

Here goes useful info for those interested in following, or applying for this initiative. The public call involves hiring two professionals, for web communication and web technology. Candidates have until Feb 10 to apply.
Our goal is to provide #museums and other #memoryinstitutions with an open tool that facilitates the exploration of decentralized social networks — #TheFediverse.

#MuseTech#ActivityPub

https://josemurilo.com/2025/02/06/more-about-the-plan-building-bridges-from-museums-to-the-fediverse/

NodeBB v4.0.0 — Federate good times, come on!

Content Warning

Today's the day! tada

After nearly a full year in development, NodeBB v4.0.0 has landed, bringing federation between NodeBB instances (and a connection to the wider fediverse of social media) to forum software.

Fedi-what?

Fediverse! Here's a TechCrunch primer about it, but at the end of the day, it doesn't really matter. All you need to know is that NodeBB plugs in to a wider social network so that you don't have to cultivate an audience, they're already there.

The genesis

It was back in mid-2023 when I had the initial idea of interconnecting NodeBB forums. Back then, I had far smaller ambitions... I wanted a singular NodeBB to be able to communicate with other forums running NodeBB. To do that, we'd need to build out a centralized service to act as a bridge between instances, and corresponding slim clients on individual installs to consume the relayed data. At the time, concept like decentralization were not even part of my thought process.

It was during this period when I was doing my research that I stumbled on Mastodon, and later, ActivityPub, the protocol that powers it all. Since then, it's been one wild ride getting NodeBB to speak the same language.

Funding

Soon after dipping my toes into all that Mastodon had to offer, I discovered the NLNet Foundation, and their corresponding fund — NGI Zero Core. With the promise of funding, NodeBB could fully commit to implementing the protocol in short order, instead of piece by piece over time. We sent in an application and were delighted to be approved for the August 2023 call.

Their funding was instrumental in providing the financial stability to experiment with ActivityPub and to participate in developer circles, such as the SWICG, FediForum, and much more.

The fund continues to operate, perhaps you could benefit, or donate to the cause. It has certainly made a difference to NodeBB.

Federate, or not, it's your choice

NodeBB v4 comes shipped with the capability to interact with other NodeBB forums and any other ActivityPub-speaking software, right out of the box. We opted to make this a core feature instead of a plugin, since there were many changes made to core to support even the concept of accepting content from outside itself.

To that end, any users upgrading from v3.x will automatically have federation disabled, in order to reduce surprise. Any new forums will federate automatically.

You can turn federation on and off (and adjust some other fun toggles) directly from ACP > Settings > Federation (ActivityPub).

Even after turning federation on, how you use it shapes how well connected you will be. There is no centralized authority artificially boosting your content, so the name of the game is establishing two-way follow relationships to other sites.

The ActivityPub Equalizer

We're not alone in this journey to interoperate with other decentralized services. We're not even the only forum software to attempt to do so.

  • Discourse has a working plugin.
  • Ghost is building out in the open.

I specifically highlight these two because they both started in the early 2010s, same as NodeBB. It's always been a bit of an informal competition between us, and we always checked in on what the others were doing (growth-wise, pricing-wise, etc.) Truth be told, I don't think the ghost team ever really noticed NodeBB, but I digress...

The funny thing about ActivityPub is that at the end of the day, the overarching goal of seamless communication breaks down any barriers between competing organizations.

NodeBB and Discourse have been vying for the exact same market share (forums, community-building, self-started or enterprise) for over 10 years, and it was only after ActivityPub came around that the dev teams even started talking to one another.

Funny how that works.

So how does it all work?

Our documentation portal has been updated with the latest information about the ActivityPub functionality in v4.

If you have any questions about how it works or how to configure some aspect of it, please don't hesitate to reach out in the corresponding v4 support thread.

If you run NodeBB, the quickest way to see this in action is to upgrade to v4, and then paste this post's URL into your search bar. It should show up automatically, and you should be able to read and reply to it, directly from your own forum. Neat!