There&#x27;s a thing called GNUSocial, which I think is open source and federated. No idea if it&#x27;s popular, I&#x27;ve never heard of it before someone mentioned it on HN a few days ago. <a href="https:&#x2F;&#x2F;gnu.io&#x2F;" rel="nofollow">https:&#x2F;&#x2F;gnu.io&#x2F;</a>