Mastodon
US alternative: Twitter/XDecentralized microblogging software and network that lets communities run their own social servers.
Open SourceFully European
Overview
Mastodon is free, open-source software for running federated microblogging servers that interoperate across the broader Fediverse. Users can join a server that matches their community norms or run their own, which prevents the platform logic from being captured by a single owner.
Why it is listed
Replaces
Twitter/X
European signal
Reviewed as strongly European-aligned
Privacy and hosting notes
No ads or ranking algorithms; privacy depends on the server you join or host.
Funding and ownership
Donation-funded nonprofit model; the 2024 annual report shows €2.2M total revenue, and Mastodon also announced a €614k Sovereign Tech Agency agreement in 2026.