This sounds pretty similar to what we've done with Peergos [0]. It's a p2p e2ee social filesystem. You can migrate servers unilaterally without losing any data, whilst keeping all your social connections, unlike email, and with all existing links to your stuff continuing to work. The social media aspect is discussed here: https://peergos.org/posts/decentralized-social-media

We take adversarial interoperability with ourselves to the next level.

[0] https://peergos.org