Interesting new(?) ActivityPub platform: Holos, the server runs on your own phone
https://holos.social/
> A Mobile-First Federated Social Network
> Connect to the fediverse through a relay server designed specifically for mobile devices. Join a decentralized network where you control your data, your privacy, and your social experience.
> Unlike traditional social networks where your data lives on remote servers, Holos runs a complete ActivityPub server directly on your smartphone. Your posts, followers, and cryptographic keys stay on your device, giving you control and the ability to migrate between relays.
> A Mobile-First Federated Social Network
> Connect to the fediverse through a relay server designed specifically for mobile devices. Join a decentralized network where you control your data, your privacy, and your social experience.
> Unlike traditional social networks where your data lives on remote servers, Holos runs a complete ActivityPub server directly on your smartphone. Your posts, followers, and cryptographic keys stay on your device, giving you control and the ability to migrate between relays.