or
or
or

Overview: Bluesky and the ATmosphere

The ATmosphere is the information ecosystem based on ATproto, the protocol developed by and for Bluesky. More interconnected apps are emerging. The potential for better online conversations is profound... if adequate revenue streams can be confirmed.

(last edit: February 2025)

Just as Mastodon is on the Fediverse, an information ecosystem where it and other apps can interact using the ActivityPub protocol, the Bluesky protocol (ATproto) underpins the ATmosphere ecosystem. In 2025, I'm betting that this is the most promising ground for #AI4communities.

Origins: Bluesky

ATproto was originally going to underpin Twitter before Elon Musk bought it. Moreover, when the Bluesky team then spun off from Twitter, they decided to keep many things unchanged, making the transition easier for people fleeing X.

The result looked and felt so similar that many people didn't spot how the open, permissionless nature of this new environment set Bluesky apart.

Some key Bluesky features:

  • Custom feeds, each a subset of the Bluesky firehose, tuned to a particular community's interests and moderation preferences, created by anyone using a variety of 3rd party tools (see Bluesky custom feeds) and usable by anyone by simply pinning the feed to their interface
  • Labellers apply labels to accounts - like custom feeds, anyone can create one, using a variety of tools, and anyone can subscribe to them if they want to see the label
  • Block/mute lists are a sort of labeller: subscribe to one and you'll never see content from anyone on the list in your timeline
  • Starter packs package a list of up to 150 people and (optionally) custom feeds relevant to a particular topic, and provide a feed of the people's posts.
  • 3rd party apps: you don't need to use the official Bluesky app - there are many others, and because the ATmosphere is permissionless they won't go the way of Tweetdeck.

Enter the ATmosphere

The ATmophere is a permissionless ecosystem - anyone can build anything they like, and can access the Bluesky feed, without having to get Bluesky Social PBC's permission.

So, like Mastodon, Bluesky is not the only kid on its protocol block: in mid-2024 the Whitewind blogging platform launched, and within a few months a plethora of other apps were in beta, including Instagram- & TikTok lookalikes (all tools tagged #atproto and #tool).

Is it decentralised?

Yes, but not as decentralised as Fediverse. The key arguments in this once-fractious debate were both articulated and calmed by two protocol engineers: Christine Lemmer-Webber (ActivityPub co-author) and Bryan Newbold of Bluesky, who exchanged three enormous blog posts. After reading, annotating and generally struggling through all three (and more), I came out with a few conclusions (paraphrased from my newsletter from December 2024 and January 2025):

  • There are different degrees of decentralisation, and different ways to get there. A comparison between the relatively mature Fediverse and Bluesky, with its brand-new protocol, is therefore tricky, particularly as Bluesky is focusing first and foremost on providing an X-like experience as possible for everyone fleeing X, which required certain choices to be made.
  • There are too many blog posts, not enough wikis - someone should lock these two in a room somewhere until they come up with a text they both agree on
  • I hope this protocol competition will evolve until the two spaces complement each other, as:
    • ATProto's shared-heap model structurally favours few servers, "and thus has a natural centralizing force"
    • ActivityPub has an incentive to keep the average followers/user low.
  • the Fediverse will therefore probably remain a good place for cozyweb spaces, and co-exist with more global conversations on the more centralised and business-like ATmosphere.
  • The world needs both.

What does the ATmosphere represent?

I first saw this when I published my December newsletter, and an extract from it as a stand-alone post, on Whitewind (see everything I Do or Think tagged #Whitewind).

When you sign up to blog on Whitewind, you use your Bluesky ID, and your blog posts live in your Bluesky Personal Data Store. So it's your content, and if Whitewind disappears, you can take it with you to another provider (or build your own), and all of your links keep working. Whitewind doesn't own you. You own you.

Moreover, there's "seamless comments integration with BlueSky: a comment posted to the blog is shared on the commenter's Bluesky account, and whenever someone shares the post on Bluesky it also appears under the post" - Thinking transparently in the ATmosphere.

The code for that integration is freely available, so this has massive implications for website-based communities, something I'm currently exploring.

Relevant resources

Trotsky
trotsky.pirhoo.com

"a type-safe library to build automation at the top of ATProto/Bluesky API... to make automating actions on Bluesky both friendly and highly flexible... a domain-specific language (DSL) and builder pattern abstraction ... to streamline common sequences of actions (like searching posts, replying, following, liking, etc.) which typically requir…

Remember Nuzzel? A similar news-aggregating tool now exists for Bluesky | Nieman Journalism Lab
www.niemanlab.org

"Sill shows the most popular links being shared by accounts you follow on Bluesky and Mastodon", linking through to "the individual posts... with what people said about" them. You can sort (“newest” or “most popular”), "hide reposts, and limit posts to the last 3, 6, 12, or 24 hours".Built in response to the death of …

Blacksky
opencollective.com

"Blacksky Algorithms, the team behind Blacksky and rsky, is now officially Blacksky Algorithms Inc", a Delaware C-Corp with its own fiscal host, and bigger ambitions."Blacksky will continue to rely on voluntary, member-supported subscriptions while also building and hosting technical infrastructure for developers, communities, and t…

Bluesky’s science takeover: 70% of Nature poll respondents use platform
www.nature.com
Card image

More evidence that science is thriving on Bluesky: "Seventy per cent of [almost 6,000] Nature readers who responded to an online poll are using the social-media platform Bluesky...53% said they used to be on X but have now left...55% of respondents to the question ‘What do you use Bluesky for?’ said ...to connect with other scientists, keep u…

25/01/2025
Flushing Meta and heading for clearer skies (Newsletter January 2025)
mathewlowry.myhub.ai
Card image

I've been cleaning out a few rotten systems recently.

As academic Bluesky grows, researchers find strengths—and shortcomings
www.science.org

According to Science, Bluesky "fosters collegial interactions among scientists, but potentially limits interactions beyond the academic community".It is becoming "the de facto meeting place for academics—many of whom seem to enjoy this “good boring.”". Why?default reverse chrono feed supports smaller accounts, and doesn't …

15/01/2025
Free Our Feeds
freeourfeeds.com

"With Zuckerberg going full Musk last week, we can no longer let billionaires control our digital public square... it will take independent funding and governance to turn ... AT Protocol—into something more powerful than a single app... an entire ecosystem of interconnected apps and different companies that have people’s interests at heart. …

How Does BlueSky Work?
steveklabnik.com

"some of the design and the principles behind this design, as I understand them... we’re going to start by exploring atproto, and then talk about how BlueSky is built on top of it"Basic infrastructural elementsIn atproto:users create records that are cryptographically signed to demonstrate authorship.Records have a schema called a Lexico…

12/01/2025
Lexicon type for markdown notes
mathewlowry.myhub.ai

"a lexicon type that supports markdown style notes... for syncing your (public) obsidian/logseq notes on your pds, just having a place where people can view your research notes, personal knowledge management, or community wiki's, which people can later build custom front ends for"Essential for MyHub on ATmosphere, and its already be…

Estimating the bandwidth usage of social protocols
peergos.net

Mathematical comparison of ATProto and ActivityPub

Re: Re: Bluesky and Decentralization
dustycloud.org
Card image

CLW with a response to Bryan Newbold's response to her post, so: "my final thoughts (for my blog at least) on Bluesky and decentralization".tl:dr; "my assertion was that Bluesky was neither decentralized nor federated. In my opinion many of the points raised in Bryan's article solidify those arguments... [but] "credib…

Adding Bluesky-powered comments to any website in five minutes | Cory Zue
www.coryzue.com

"Now you can ... create an instant Bluesky-powered comments section on your own site! Here’s an example of how I added it to my site—which is built on Jekyll."

Benefits of an open network
emilyliu.me
Card image

Good non-technical explanation of Bluesk's potential, which is hidden to keep things simple for most users for good UX reasons: "While Bluesky looks like other social apps, it’s actually quite different. It’s an open network".Emily uses Chrome as a good metaphor: "Bluesky as a browser with a whole marketplace of extensions"…

Thinking transparently in the ATmosphere
whtwnd.com

"This post was extracted from the draft of my December newsletter and published on Whitewind, demonstrating how a new array of apps on the ATmosphere - the ecosystem built with ATProto, Bluesky's protocol - could potentially usher in seamless decentralised collective intelligence."

This newsletter is posted on Bluesky
whtwnd.com

"I usually circulate my newsletter to its subscribers via Mailchimp before reposting it to Medium for my subscribers there. However, for this edition I posted this content from Obsidian, my notemaking tool, direct to Bluesky's Atmosphere. It's early days, but I think this augurs well for decentralised collective intelligence."

Last Month in Bluesky – June 2024
fediversereport.com

3 important points (for me, right now):"The two biggest labelers dedicated to content moderation have called it quits... a shift in current expectations what labelers are for. Bluesky advertised labelers as a way for communities to help protect themselves, calling ‘community labeling’. The situation ... has shown that labelers that are a hig…

Sill | Connect Your Accounts
sill.social

connects to your Bluesky and Mastodon accounts, gathers all of the links posted to your timeline, and aggregates them to show you the most popular links in your network

Get Your Bluesky Personality Analyzed (With a Side of Gentle Roasting)
blueskyroast.com

"Let our AI analyze your posts, roast your takes, and reveal what your posting history says about you".Honestly not roasty at all - rather hagiographic, judging by mine, but who am I to argue with a 88% authenticity score, even if I have no idea how that is measured? https://blueskyroast.com/roast/mathewlowry.bsky.social.But a pretty coo…

30/11/2024
Sky Zoo
skyzoo.blue
Card image

"Assigns you a Bluesky animal based on your recent activity"Apparently I'm part of a squirrel squad and a bit of a Social Butterfly Explorer with enough discipline to (mostly) post before and after work (except for Friday afternoons).

29/11/2024
Bluesky Follower Scanner
progfeeds.mariozechner.at

"Analyze accounts that follow you". eg spot bots & trolls, discover followers you really should follow back, and even "Get raw JSON to do more analysis yourself"."Runs entirely on your device, without login" and - illustrating the openness of your Bluesky content - "You can analyze the followers of any accoun…

29/11/2024
Reply on Bluesky and Decentralization - bryan newbold
whtwnd.com
Card image

"a reply to Christine Lemmer-Webber's thoughtful ... "How decentralized is Bluesky really?", Hubbed earlier, which "raises the bar on analysis in this space. However, I disagree with some of the analysis".First, agreement with CLW's "shared heap" image, and a good summary of how Bluesky works: "atp…

How decentralized is Bluesky really? - Christine Lemmer-Webber
dustycloud.org
Card image

ActivityPub co-author Christine Lemmer-Webber "often get asked whether or not I have opinions about ATProto vs ActivityPub... I do ... but I am usually head-down focused on building... [and] anything I had to say on the subject would not be received productively". But, encouraged by a core Bluesky developer, here is her longread.It'…

Convert BSky Starter Pack to List
nws-bot.us

Does what the title says: converts a Bluesky Starter Pack into a List. Tested successfully here: https://bsky.app/profile/mathewlowry.bsky.social/post/3lbmwcewk2226

23/11/2024
WhiteWind atproto blog | WhiteWind blog
whtwnd.com

"a markdown blog service using atproto... Your article is immediately delivered to all the federated atproto services" - basically the intersection of Bluesky & Obsidian, and a key building block for myhub.Basically a platform for posting blogs onto, using your Bluesky account: your blog is simply https://whtwnd.com/{Bluesky handle o…

On Bluesky and enshittification – The Fediverse Report
fediversereport.com
Card image

Taking funding from a VC firm called Blockchain Capital raised quite the furore: " a common response ... was that “the enshittification has started”.""Bluesky is aware of the negative connotations ... explicitly stating that “the Bluesky app and the AT Protocol do not use blockchains or cryptocurrency, and we will not hyperfinancial…

ActivityPub vs AT Protocol - YouTube
www.youtube.com

An almost 30min video from Justin Garrison in July 2023 asking: "What is the difference between Mastodon's ActivityPub and BlueSky's AT Protocol?... We're not going to be looking at [apps] ... like Mastodon and Bluesky or Threads" - instead, a mid-level dive into the underlying protocols, and "some pros and cons of ea…

AI4Communities & Bluesky
mathewlowry.medium.com
Card image

My mid November 2024 newsletter summarises how a deep dive into Bluesky has changed how I view #AI4Communities, and summarises some of the most influential things I've read recently.

Bluesky and enshittification
doctorow.medium.com

No one is the enshittifier of their own story

Bluesky’s Stackable Approach to Moderation - Bluesky
bsky.social
Card image

Bluesky's announcement of their open-sourcing of "Ozone, our collaborative moderation tool... individuals and teams can work together to review and label content", coupled with the ability for people and communities to "run your own independent moderation services, seamlessly integrated into the Bluesky app".This enables &…

A complete guide to Bluesky 🦋 – mackuba.eu
mackuba.eu

Another Bluesky guide with "the tips & tricks that I often give to friends when I send them an invite code", including a brief but informative history lesson.Of particular interest to me in early November 2024:"they promise they won’t “enshittify” the service in future... [are] explicitly building the network to be “billionaire-…

Cookies disclaimer

MyHub.ai saves very few cookies onto your device: we need some to monitor site traffic using Google Analytics, while another protects you from a cross-site request forgeries. Nevertheless, you can disable the usage of cookies by changing the settings of your browser. By browsing our website without changing the browser settings, you grant us permission to store that information on your device. More details in our Privacy Policy.