Flohmarkt is a free open platform for small ads and selling things ("Flohmarkt" is the German for flea market). It's part of the Fediverse so the small ads can federate to other servers, and people can interact with Flohmarkt from Mastodon etc accounts.

If you want to post or browse adverts there is a server list:

🌱 https://codeberg.org/flohmarkt/flohmarkt/wiki/flohmarkt-instances

There is techy info on their Codeberg page:

🌱 https://codeberg.org/flohmarkt/flohmarkt

You can follow their lead dev's account at:

🌱 @grindhold

#Fediverse #ActivityPub

Implementing your own #Fediverse #ActivityPub server sounds like a good idea until you see the mush of half-implemented protocols that #Mastodon actually is. #ActivityStreams Link type? Profile? Tombstone? Whomst?

Why is there a webfinder endpoint? I don't want skeletal twinks fingering my web!?

And also an RSA key pair? Publicly being this embarrassing should be proof enough, nobody would dare pretend to be *this*!

Week in Fediverse 2026-07-10

Servers

- Betula v1.8.1
- Stegodon v1.8.6
- Ktistec v3.8.0
- Mitra v5.7.0
- Ibis v0.3.3
- Gathio v1.6.3
- NodeBB v4.14.0
- Wanderer v0.20.0
- Wafrn v2026.07.01
- Gush! v0.0.40
- PieFed v1.7.5
- Harmony v1.4.0

Clients

- Mastodon for iOS v2026.05
- tooi v0.27.0
- Voyager v2.47.4
- Aria v1.5.7
- Holos v1.14.0
- Rocinante v1.1.0
- chan-fe: Imageboard-style frontend for Mitra and Mastodon-compatible fediverse APIs

Tools and Plugins

- tag-federation.online: How Widely Do Hashtags Federate?
- Fedigraph: A dashboard for exploring the fediverse

For developers

- BotKit v0.5.0

Protocol

- FEP-4772: Representing bookmarks
- FEP-521b: Switch the default in FEP-521a to be 76171% cooler

-----

#WeekInFediverse #Fediverse #ActivityPub

Previous edition: https://mitra.social/objects/019f29a4-78da-7a53-805d-72c8e43916c2

#HolosSocial relay is confirmed to be very stable. I will officially tag it soon so admins can run their own relay with a script to easily install it on their VPS.
Using Holos with a custom domain and a cloud for media allows you to own your portable identity on the #Fediverse. Relays become only an infrastructure for it. Your device runs the #ActivityPub server and works as smoothly as any other app. Micro-blogging, media, and video, all from a single account. Switch with a simple tap.

#Lazyweb When I want to spin up my own #Fediverse instance that supports #Markdown when composing a post and that can handle my significant amount of followers with a seamless migration from my current #Mastodon instance, which #ActivityPub Implementation would you use? Ideally it should be a simple rootless container setup that JustWorks™ with podman. Perfection would be a single, self-contained container without the need to spin up several ones for databases or other stuff.

In a few days, the last brick of the relay server will be published for an official release and a tag.
A lot of stress when you are alone, but after a few weeks the work has paid off, it is really stable.
Running your own #ActivityPub server on your phone will be as simple as using any other app. You will not be limited to a lookalike: micro-blogging, media, videos, all you want in a simple tap.

#HolosSocial

I am psyched about #kazarma, the bridge between #matrix and #ActivityPub

https://kazar.ma/

If you are at #DwebCamp and you love the #Fediverse please come see my Introduction to #ActivityPub talk at 5pm today in the #OpenSocialWeb tent! It means a lot.

SZ: "Heute wird die sogenannte Open Social Web Alliance #OSWA in Berlin ihre Formierung verkünden. Das Bündnis will nach eigenen Angaben 'das Momentum rund um gemeinwohlorientierte, offene soziale Netzwerke als Gegenmodell zu Big-Tech-Plattformen wie Facebook, Tiktok oder Youtube weiter befeuern'."

https://www.sueddeutsche.de/dossier/tiefgaenge/open-social-web-neue-allianz-legt-fahrplan-vor-6e2bd0f6

#Mastodon #Fediverse #OpenSource #ActivityPub #ATProto #FOSS

@bmann.ca @cwebber @dholms.at at #dwebcamp talking about #activitypub and #atproto

Alt...

Boris Christine and Daniel

Goodmorning fedi, I just woke up in a windy tent in the middle of a field and sleepily scrolled thru all the opening talks at #DwebCamp to figure out what my first stop needs to be: def have to catch @cwebber, @dholms.at and @boris discuss the trade offs, design decisions and points of convergence between #ActivityPub and #ATProto

Alt...

Christine Lemmer Webber is lead author and co-editor of the W3C ActivityPub specification. Daniel Holmgren is Head of Protocol at Bluesky, working on the AT Protocol specification at the IETF. Join us for a discussion on decentralization trade-offs and other design decisions in the two protocols, and what that means for different architectures, structures, and even future points of convergence.

Are you into 3D printing, self-hosting and the Fediverse?

If so you might want to look into Manyfold, a FOSS Fediverse platform which lets you upload and share 3D print models:

🌱 https://manyfold.app

You can follow the official accounts at:

🌱 @manyfold@3dp.chat (main)
🌱 @manyfold@makertube.net (videos)

You can host your own Manyfold server using the instructions at https://manyfold.app/get-started/installation (be warned though, installation does require a bit of tech skill).

#3DPrinting #SelfHosting #Fediverse #ActivityPub

What project you think #fediverse is missing the most currently? 🤔

#needhelp #askfedi #activitypub #needboost

Habe gestern zwei Bluesky Accounts nach Eurosky.social umgezogen - ein paar Klicks, fertig. Wenn man sieht wie einfach so etwas gehen kann, dann kann man #Mastodon und #Activitypub an die Wand klatschen. Ich frage mich echt, wie man sich einen solchen Schwachsinn für einen Account Umzug innerhalb von Mastodon ausdenken kann. Nicht praktikabel, nur handhabbar für Nerds. Ein System, dass sich Frickler ausgedacht haben ohne den Anwender berücksichtigt zu haben.

I just discovered the Fediverse (English) Wikipedia page has a huge section on AT Protocol and I question why. It seems like excessive promotion of Bluesky and its protocol that is not compatible with ActivityPub, both technically and in spirit. Illustrating bridging isn't the same as compatibility. Might as well add sections for other random network protocols like XMPP (Jabber).

https://en.wikipedia.org/wiki/Fediverse

#ActivityPub #Fediverse #wikipedia

Week in Fediverse 2026-07-03

Servers

- TinyAP v0.1.10
- GoToSocial v0.22.0
- Mobilizon v5.2.4
- Bonfire v1.0.5
- PeerTube v8.2.2
- Ktistec v3.7.0
- PieFed v1.7.0
- Mastodon v4.6.3
- Hollo v0.9.6
- ActivityPub for WordPress v9.0.2
- NeoDB v0.16.3
- Wanderer v0.19.3
- Trunk & Tidbits, May 2026 (Mastodon)
- Lemmy Development Update June 2026 and 1.0.0-beta.1

Clients

- Fedilab v3.42.1
- Pachli v3.7.1
- Aria v1.5.5
- Rocinante v1.0.9
- Holos v1.12.0
- Mitra Mini v0.4.2

Tools and Plugins

- FediFetcher v7.1.21
- owncast-emojiwall v2.1.0
- Polls For ActivityPub (WordPress plugin)

For developers

- Why implementing ActivityPub is hard, and why it doesn't have to be (Fedify)

Protocol

- FEP-8c13: Context-Authority Routing with Object Integrity Proofs for Restricted Threads
- FEP-f228: Backfilling conversations (Final comments)
- FEP-7628: Move actor (Final comments)

-----

#WeekInFediverse #Fediverse #ActivityPub

Previous edition: https://mitra.social/objects/019f058a-b456-7c32-a9ee-f6ef93e8ee55

RE: https://hackers.pub/@fedify/2026/why-activitypub-is-hard

This is a really great, technical overview of how the fediverse works behind the scenes. And really makes you appreciate that it works at all.

Massive props to @hongminhee for this write-up and all their work, and those of others that make fediverse possible.

#fediverse #activitypub

I'm requesting final comments on FEP-7628: Move actor

#fep_7628 #fep #activitypub

Mastodon Collections === Loops Starter Kits

https://joinloops.org/starter-kits

Search Loops Kits on Mastodon, and vice versa.

powered by #activityPub

When X, Meta and TikTok relaxed their rules on hate speech, racism and transphobia, they didn't undermine the open social web.

They proved why this needs to exist.

Safety and mental health come first here. They're the foundation everything else stands on.

Not optional. Not negotiable. The vulnerable come first, always.

I have a roadmap to improve this, and I'll soon be asking for your feedback to make these spaces safer for the people who need them most.

#safety #humanRights #activityPub

How does ActivityPub really work?

Listen to this presentation by #ActivityPub co-author @evanprodromou given at the last FediForum:

https://spectra.video/w/s8DKnnaPFw2b1JS8zD5VE8

Two things you can see here... It's pretty hot! That's why I stayed home and implemented a missing feature into snac. That's what you can also see - it finally sends push notifications to devices! In this case, we can see notifications coming from #MastoBlaster App for iPhone.

What we can also see, it's still a bit faulty and not the expected content, but a first success here at least ;) I'll make some further adjustments when there's time and get in touch with @grunfink@comam.es to check if we can get this upstream. Thanks to @stefano@bsd.cafe for testing with me :)

#fediverse #mastodon #fedi #activitypub #snac2 #c #programming #clang #MastoBlaster

Alt...

snac2 sending push notifications to a user via MastoBlaster App on iPhone

Hashtag following also allow URLs to RSS feeds of ActivityPub objects (like e.g. https://mastodon.social/tags/ThankYouTuesday).

Users can now configure a webhook to receive an HTTP POST for every notification. This can be useful for implementing bots that react to activities, like autorepliers, chatbots or interactive textual games (see snac(1) for more information).

The number of pending follow confirmations is shown next to the "people" link.

Faster performance metrics (contributed by dandelions).

Improved lowercasing in hashtags (contributed by postscriptum).

A search-by-url tweak for implementations that return 200 for invalid webfinger queries (e.g. piefed).

Mastodon API: added follow confirmation endpoints, fixed collisions in attachment file names.

Fixed potential crashes in attachment uploads.

https://comam.es/what-is-snac

If you find #snac useful, please consider buying grunfink a coffee or contributing via LiberaPay.

#snacAnnounces #FrugalFediverse

Notifications are now shown in a more compact way (i.e. all reactions are shown just above your post, instead of repeating the post ad nauseam for every reaction).

New command-line option unmute to, well, no-longer-mute an actor.

The private timeline now includes an approximate mark between new posts and "already seen" ones.

Fixed a spurious 404 error in the instance root URL for some configurations.

https://comam.es/what-is-snac

If you find #snac useful, please consider contributing via LiberaPay: https://liberapay.com/grunfink/

#snacAnnounces

This release has been inspired by the song The Answers to the Questions by #Christabell and #DavidLynch.