Mastodon
German non-profit social network founded by Eugen Rochko in 2016. Federated and open-source, with no ads, no algorithms, and no single point of control. Used by 47M+ accounts across 80,000+ independent servers. Hosts the European Commission's official server.
Quick facts
Why does it score 97?
Mastodon is registered as a non-profit gGmbH in Germany.
Mastodon has no outside investors; founder Eugen Rochko transferred ownership to the non-profit itself in 2025.
Mastodon's flagship instance runs on its own infrastructure in Germany.
Mastodon is fully open source and funded by community donations rather than advertising or venture capital.
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