Mastodon is a social network[2] that operates on a federated system, also known as the Fediverse. This free and open-source platform, which was launched in October 2016, allows users to post short messages, referred to as toots, of up to 500 characters. Users are free to join specific servers each with its unique rules and themes. Mastodon employs a community-based approach to moderation, offering mechanisms to filter content, block and report users. Its search capability is limited to hashtags and mentioned accounts, differing from Twitter[3]’s comprehensive full-text search. Despite potential security[4] challenges owing to its decentralized structure, Mastodon has implemented measures to address vulnerabilities like DDoS attacks and data breaches. The platform is primarily crowdfunded, does not run ads, and operates as a registered nonprofit organization[1] in Germany.
Mastodon is a free and open-source software for running self-hosted social networking services. It has microblogging features similar to Twitter, which are offered by a large number of independently run nodes, known as instances or servers, each with its own code of conduct, terms of service, privacy policy, privacy options, and content moderation policies.
Original author(s) | Eugen Rochko |
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Developer(s) | Mastodon gGmbH |
Initial release | 16 March 2016 |
Stable release | 4.2.8
/ February 23, 2024 |
Preview release | 4.2.0-rc2
/ September 19, 2023 |
Repository | |
Written in | Ruby on Rails, JavaScript (React.js, Redux) |
Operating system | Cross-platform |
Platform | iOS, Android, Linux, BSD, Sailfish OS, macOS, Microsoft Windows |
Available in | 93 languages |
Type | Microblogging |
License | AGPLv3+ |
Website | joinmastodon |
Each user is a member of a specific Mastodon server that can interact seamlessly with users in any other server. This is intended to give users the flexibility to select a server whose policies they prefer, but keep access to a larger federated social network. Mastodon is powered by the ActivityPub protocol, making it part of the Fediverse ensemble of services such as Lemmy, Pixelfed, Friendica, and PeerTube.
Mastodon was created by Eugen Rochko and announced on Hacker News in October 2016, and gained significant adoption in 2022 in the wake of Twitter's acquisition by Elon Musk.
The project is maintained by German non-profit Mastodon gGmbH. Mastodon development is crowdfunded and the code does not support advertisement.