
Free, open-source decentralized social network
Mastodon is a free, open-source decentralized social networking platform built on the ActivityPub protocol. It allows users to create and join independently operated servers (instances) that interconnect to form a global social network called the fediverse. With no ads, no algorithms, and full user control over data, Mastodon offers a privacy-focused alternative to centralized social media platforms.
Join any server or host your own — all instances interconnect via ActivityPub to form one global social network
Chronological timeline with no advertising, no promoted content, and no algorithmic manipulation of your feed
Share and comment on others' posts with quote post functionality, introduced in Mastodon 4.5
Choose post visibility per-post: public, unlisted, followers-only, or direct messages
Each server sets its own rules and moderation policies, with tools for external blocklists and content scanning
Attach images, videos, audio, and polls to posts with alt-text support for accessibility
Communicate with any platform that supports ActivityPub, including Pixelfed, PeerTube, Lemmy, and more
Users who want full control over their data and an ad-free social media experience
Organizations and interest groups can run their own instances with custom rules and moderation
Public figures seeking a platform free from algorithmic suppression and corporate control
Tech communities and open-source advocates building on open web standards
Fully open-source codebase (AGPL-3.0) that anyone can audit, modify, and self-host
Redesigned profile pages let creators and public figures showcase their work and content
Join as many servers as you want and migrate your account between instances while keeping your followers
Companies wanting to establish a presence on the decentralized web with their own branded instance

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