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I'd never heard of this project, but now I'm excited about it! From the link:
Our new project, "Ditto", is a competitor to Mastodon. It is an open-source, self-hosted social media server for online communities. While it borrows many ideas from Mastodon (including its API), it is built on the Nostr protocol. Ditto brings the best parts of Mastodon to Nostr, including dozens of native apps, and several new features not normally available on Nostr.
I don't know enough about Nostr to know how this would work exactly, or if it depends on centralizing aspects of the Nostr ecosystem, as per @koob. Given Dorsey's funding of it, I'd think not, or at least, not egregiously? Anyway, cool.