Mastodon operates as three distinct interconnected components: First, Mastodon the free and open-source project—a global top 1% FOSS project on GitHub with over 1,000 contributors, representing cutting-edge social networking technology. Second, the Mastodon social network—software installed on 10,000 individual servers with 1 million monthly active users. Mastodon gGmbH, our German non-profit, operates the largest server (mastodon.social) with approximately 300,000 monthly active users. Third, as part of the broader ActivityPub-powered Fediverse.
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Mastodon GGmbH
joinmastodon.org
github.com/mastodon/mastodon