Social network alternatives are platforms outside the big advertising-funded services. They include federated Fediverse software such as Mastodon, Lemmy and Pixelfed, plus protocol-based services such as Bluesky, where users or communities can host or move their accounts.
This guide sits under the wider open source social network topic and compares how the main options work, who runs them and what trade-offs they carry.
What makes a social network an alternative?
A traditional social networking service hosts all its content on servers managed by the owner of the website. The alternatives change that arrangement in one of two ways. Some spread the network across many independently run servers. Others separate the user’s account from the app that displays it, so the app can be replaced without losing followers.
The first model is known as the Fediverse, a portmanteau of federation and universe. According to Wikipedia’s Fediverse entry, the majority of Fediverse platforms are based on free and open-source software and create connections between servers using the ActivityPub protocol. The second model is best represented by Bluesky and its AT Protocol.
Neither model removes the need for trust. It moves it. Instead of one company setting the rules, a server administrator, a protocol company or a volunteer moderation team does so.
How the Fediverse works
Each server in the Fediverse is called an instance. Anyone can run one, set its rules and decide which other instances to connect to. Accounts on different instances can still follow and reply to each other because the software speaks a common protocol.
That protocol has a short history. In January 2018, the W3C presented ActivityPub as a recommended standard, aiming to improve interoperability between software packages and to supersede the older OStatus protocol. By 2019, almost all software that had used OStatus had added support for ActivityPub, according to the same Fediverse overview.
One consequence is that different kinds of service can talk to each other. A user on a Lemmy instance, which is a social news service, can interact with a post from an instance of mbin, a similar service, as well as microblog statuses from Mastodon.
Mastodon: the best-known microblogging option
Mastodon was first released in 2016 by Eugen Rochko. It has positioned itself as an alternative to mainstream social media for people seeking decentralized, community-driven spaces, as described in Wikipedia’s Mastodon article.
The project is run as a nonprofit. It was registered in Germany as a nonprofit organization between 2021 and 2024, and a US nonprofit was established in April 2024, per the same source.
For newcomers, the practical points are these:
- Pick an instance whose moderation rules and topics suit you; you can follow people on other instances regardless.
- There is no single algorithmic feed controlled by an advertiser. The home timeline is built from accounts you follow.
- Moderation is local. Moderators handle content from their own users and also from remote users on other instances.
That last point is a genuine burden. Wikipedia notes that decentralized platforms introduce new challenges for user trust and safety, because moderators are responsible not only for local users but also for remote ones.
Bluesky and the protocol approach
Bluesky takes a different route. It is owned by Bluesky Social PBC, a benefit corporation based in the United States, and was developed as a reference implementation of the AT Protocol, an open communication protocol for distributed social networks, according to Wikipedia’s Bluesky entry.
The idea began in 2019, when Jack Dorsey, then-CEO of Twitter, announced the Bluesky initiative to explore decentralizing Twitter. The service launched as an invitation-only iOS beta on 17 February 2023, and opened registrations to the general public on February 6, 2024, by which time it had passed 3 million users.
The trade-off is centralization in practice. As of November 2024, most components of the protocol were either available only from Bluesky Social or needed to operate with services run by the company, per the same article. Users who care about who runs the infrastructure should weigh this against the ease of sign-up.
Choosing between the options
| Option | Model | Best for |
|---|---|---|
| Mastodon | Federated, ActivityPub | Microblogging with community-run servers |
| Lemmy and mbin | Federated, ActivityPub | Forum-style discussion and link sharing |
| Bluesky | AT Protocol, company-operated core | A familiar short-post experience with portable accounts |
| Diaspora | Federated, own protocol | Privacy-minded personal networking |
Table details are drawn from the Fediverse and Bluesky entries on Wikipedia.
Questions to ask before signing up
The right choice depends less on features than on what a reader wants to avoid. A few questions help narrow it down.
- Who pays for the servers? A nonprofit, a benefit corporation, a hobbyist and a university all run services in this space, and each has different incentives and different failure modes. A small instance run by one volunteer can disappear if that person loses interest.
- Who can read the data? Federation means posts are copied to every server that follows the author. Public posts are public everywhere, so these networks suit open conversation better than private messaging.
- How portable is the account? Fediverse software generally lets a user migrate followers between instances, while the AT Protocol is designed so an account can be moved between hosts. In both cases, the practical ease of moving depends on the software in use.
- What does moderation look like? Each instance publishes its own rules and may block other instances entirely. Reading those rules before joining avoids surprises later.
Why the transition is gradual
Most people join an alternative network while keeping an account on a larger one. The main obstacle is rarely technology. It is that friends, colleagues and favourite creators are spread across several places, so a new account can feel quiet at first. Following topics and hashtags, and importing a list of accounts from an existing service where the software allows it, helps fill a timeline quickly.
Users who want to run something themselves can host a small instance, but doing so brings real responsibilities: security updates, backups, storage costs and moderation. Many readers will be better served by joining an established instance and supporting it, whether through donations or by volunteering as a moderator, than by starting a new one that few people know exists.
Diaspora is the only actively developed software project classified under the original definition of the Fediverse that does not support ActivityPub, according to Wikipedia. The diaspora guide covers it in more detail.
Readers whose main concern is data collection rather than ownership can also read about privacy-respecting social networks, which looks at that question directly.
A sensible approach is to start with one account on a general-purpose instance, follow a few topics, and only then decide whether to move or self-host. Because the networks use open protocols, moving later is easier than leaving a closed platform.
Frequently asked questions
What is the Fediverse?
It is a network of independently run servers that connect using shared protocols, mostly ActivityPub, so users on different services can interact.
Is Mastodon the same as Bluesky?
No. Mastodon is federated software using ActivityPub, while Bluesky is built on the AT Protocol and is operated by a benefit corporation.
Do these platforms use advertising?
It varies. Bluesky had no advertising as of December 2024, according to Wikipedia, and Mastodon is run by a nonprofit organization.
Can accounts on different services follow each other?
Within the ActivityPub-based Fediverse, yes. A Lemmy user can interact with Mastodon statuses, for example. Bluesky uses a separate protocol.
