Any Open Source Communication “Twitter Alternatives?” (OpenChirp?)

[Eirikr1848]

Are there any truly free and open alternatives to Twitter these days? Some people were talking about “OpenChirp” at Happy Hour in Silicon Beach (Santa Monica, California) but I cannot find a functional project by that name.x

Asking here seems like a way to get a better, more direct answer.

[lowflyer]

perhaps this one:

https://github.com/Minds