Manhodon Mastodon hosted on

By signing up you agree to our terms of service and privacy policy.

What is



  • 犯罪に関わること、法律に反することやそれを示唆することは書き込まないでください。
  • みなさんが気持ちよくご利用いただけるように、CWやNSFWの機能を適切にご使用ください。
  • ゆきすぎたBOT行為など、サーバーに極端に負荷をかけることをしないでください。
  • 以上のことを避けていただければ、マンホールに限らずご自由にお使いください。

What is Mastodon?

Mastodon is a social network based on open web protocols and free, open-source software. It is decentralized like e-mail.

Learn more
Built for real conversation
With 500 characters at your disposal and support for granular content and media warnings, you can express yourself the way you want to.
You’re a person, not a product
Mastodon is not a commercial network. No advertising, no data mining, no walled gardens. There is no central authority.
Always within reach
Multiple apps for iOS, Android, and other platforms thanks to a developer-friendly API ecosystem allow you to keep up with your friends anywhere.
A more humane approach
Learning from failures of other networks, Mastodon aims to make ethical design choices to combat the misuse of social media.