Decentralized Social Media
FLOSS alternatives to mainstream social media — self-hostable, federated tools communities can run without ads or surveillance as the price of participation.
Introduction to Decentralized Social Media Tools↑
The social media landscape is marked by a high degree of centralized power, with significant consequences for free and democratic societies. A small number of corporations now mediate how billions of people communicate, discover news, share images, host media, and collaborate on software. The harms are not accidental side effects: they follow directly from business models built on surveillance, engagement maximization, and closed ecosystems.
State-level censorship is not a viable solution, yet alternatives exist that allow different communities to operate their own platforms, whether peer-to-peer or federated. These models enable groups to apply their own social rules without relying on a single point of control, and always with the option to migrate to another instance. Calling a system “p2p” does not by itself remove hidden centres of power (Antoniadis and Pantazis, 2021). Bortzmeyer (2018) adds that so-called social networks are often not social at all: they are firms that capture a crowd for advertisers, while a genuinely social network would rest on people and associations (see Sources).
This dossier presents FLOSS alternatives to mainstream social media — self-hostable, federated tools communities can run without ads or surveillance as the price of participation. NGI / NLnet funded parts of this stack; the pages below stay on what each project does. Each tool hits a specific class of risk from centralized platforms.
Risks of Centralized Social Media↑
Understanding what is at stake is the first step toward meaningful alternatives. The dominant platforms expose users, communities, and societies to interconnected risks:
Surveillance and profiling. Platforms collect behavioural data far beyond what users consciously share: who you follow, when you are online, what you pause on, and who is in your network. This data powers advertising profiles, can be subpoenaed or leaked, and creates a permanent record that users neither own nor control.
Addictive design and mental health. Infinite scroll, variable-reward notifications, and algorithmic feeds are engineered to maximize time on platform. Research links heavy use to anxiety, depression, sleep disruption, and reduced attention span, with adolescents especially vulnerable.
Harassment and unsafe exposure. Global reach combined with weak or opaque moderation leaves victims with little recourse. Reporting systems are slow, inconsistent, and designed to protect the platform's reputation rather than the people harmed.
Opaque feeds and engagement optimization. Proprietary ranking systems decide what billions of people see, without transparency or user control. Feeds are tuned to maximize time on platform rather than user wellbeing. Users cannot inspect, adjust, or replace the logic that orders their timeline, and the incentives behind it are commercial, not community-driven.
Platform lock-in and loss of digital sovereignty. Years of posts, contacts, and community history are trapped inside proprietary silos. Leaving a platform means starting over — what Bortzmeyer (2018, p. 27) calls locking users in via the network effect; open, federated networks such as the fediverse avoid that because services exchange that information (see Sources). The EFF (2026) treats digital sovereignty as more than a slogan: who runs the stack, who can leave it, and whether communities keep real control — not a rebranded cloud contract (see Sources). Creators depend on algorithms they cannot inspect for income and reach.
Monopolization of public and cultural infrastructure. A handful of companies control not only social networking but also image sharing, podcast distribution, link aggregation, and developer collaboration. Outages, policy changes, or account bans can silence individuals and communities overnight. The FSFE (2026) argues Free Software and open standards should be the default for digital public services — not optional after proprietary procurement locks the commons in (see Sources).
Environmental cost. Data centres powering social media and AI-generated content consume enormous energy. Engagement-maximizing design further increases compute demand through constant ranking, recommendation, and content generation.
Interoperability failure. Walled gardens prevent users on one service from reaching friends on another without surrendering more data to a new monopoly. Federation promises openness, but only if implementations actually interoperate.
Why this matters now↑
These risks are no longer theoretical. Social media affects adolescent wellbeing, personal safety, and the livelihoods of journalists, activists, and creators. The longer communities depend on centralized infrastructure, the harder migration becomes and the more power accumulates in hands that are accountable only to shareholders.
For individuals, the cost is personal safety, privacy, and mental health. For communities, the cost is dependence on infrastructure they do not control and cannot leave without losing years of connections and content. For the planet, the cost is rising energy use driven by engagement-maximizing design and large-scale content processing.
Waiting for regulation alone is insufficient. Laws lag behind technology, vary by jurisdiction, and cannot easily undo network effects once a platform becomes the default place where a community lives. Practical alternatives that communities can run themselves are needed now, not after the next scandal or outage.
How these projects address these risks↑
The projects in this dossier each target specific harms of centralized social media. None is a drop-in replacement for every proprietary platform, but together they cover the full stack of social infrastructure:
 | ActivityPods 3.0 |
 | Bana |
 | Bonfire — communities can self-host (Bonfire docs; examples only—not a canonical list): |
 | Castopod — podcasters can self-host (Castopod docs; examples only—not a canonical list): |
 | Funkwhale |
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Fediverse Test Framework addresses the interoperability risk that could turn federation back into fragmentation. By testing how ActivityPub messages are parsed and rendered across implementations, it helps developers build software that actually connects rather than creating new silos.
 | ForgeFlux |
 | Lemmy — communities can self-host (Lemmy docs; examples only—not a canonical list): |
 | Kbin |
 | PixelDroid |
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Spritely addresses a risk that technical alternatives alone cannot solve: if security and privacy features are too hard to use, people default back to convenient centralized apps. It works on making decentralized social media safe and usable through better interface design.
 | Mastodon — communities can self-host (Mastodon docs; examples only—not a canonical list): |
 | GoToSocial |
 | Pleroma |
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PeerTube is a federated video platform — an alternative to YouTube. Communities can self-host (PeerTube docs; examples only—not a canonical list):
ActivityPub plus peer-to-peer delivery; live streaming, search, and remote transcoding round out the host stack.
 | Owncast |
 | Pixelfed — communities can self-host (Pixelfed docs; examples only—not a canonical list): |
 | Mobilizon — communities can self-host (Mobilizon docs; examples only—not a canonical list): |
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Decidim is open digital infrastructure for participatory democracy — assemblies, proposals, and votes. Cities and organisations can self-host (Decidim docs; examples only—not a canonical list):
A UX and code revamp keeps assemblies usable for cities and associations.
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Fedipub is a Ruby on Rails engine that implements ActivityPub so existing Rails apps can federate instead of becoming another silo. Scope: documentation, onboarding, the rest of the core standard, and common Fediverse enhancements. Source: gitlab.com/fedipub/fedipub (Manyfold).
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ActivityBot is a full ActivityPub server in a single PHP file: upload two files and the bot is on the Fediverse — media, private messages, threads, follows, content warnings, and most Mastodon-style features, without containers or a framework. Code: gitlab.com/edent/activity-bot.
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Inventaire separates its social book-sharing network from its Wikidata-federated bibliographic database so both can run as distinct, reusable projects. Until recently both cores lived on one central instance (inventaire.io); the split reduces complexity for federated social instances and lets others reuse the entities core without the social layer.
 | Overte |
 | Flarum |
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flohmarkt is a self-hostable classified-ads app for the Fediverse — local marketplaces without eBay/Facebook Marketplace lock-in. Code: codeberg.org/flohmarkt/flohmarkt.
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FediMod FIRES is tooling for Fediverse moderation (fires.fedimod.org): shared, inspectable moderation signals instead of one corporation’s opaque trust-and-safety queue.
How Can Societies Defend Themselves↑
Free/Libre and Open Source Software (FLOSS) alternatives are an essential part of a healthier digital future. They show that social platforms can exist without ads, addictive design, or surveillance business models, and that a different kind of digital world is already taking shape.
They also provide a real fallback when dominant systems fail or become harmful, much like skyscrapers rely on stairs even if we rarely use them. FLOSS tools allow communities to shape how their digital spaces work, encouraging experimentation and democratic decision-making.
Because they are not driven by profit, they can afford to support slower, more meaningful interactions and less computation-intensive practices. They can also be installed and operated locally, from a basement server to a neighborhood association, a municipal facility, or a national sustainable datacenter.
The projects above are not a complete escape from every risk overnight. Federated systems carry their own challenges: instance administrators can still make bad moderation decisions, smaller servers may lack resources, and users must learn new tools. But the fundamental asymmetry changes: power is distributed, code is inspectable, and exit remains possible. That is the minimum condition for social media that serves people rather than extracting from them.
Browse the projects in this dossier below.