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“A federated microblogging software for single users. ActivityPub-enabled, Mastodon-compatible API, supports CommonMark and Misskey-style quotes. Hollo is designed for single-users, so you can own your instance and have full control over your data. It’s perfect for personal microblogs, notes, and journals.”
Seems fairly heavyweight, however, so I probably won’t be running it, but it’s a nice take on the single-user-server Fediverse use case.