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by kalleboo 1027 days ago
Lemmy is also built on ActivityPub as part of the Fediverse and is arranged into topics (called communities). E.g. you can follow retrocomputing@lemmy.sdf.org (or web interface https://lemmy.sdf.org/c/retrocomputing) and only see retrocomputing posts.

Since it's all ActivityPub, you can follow Lemmy communities from a Mastodon client but the UX in that case is pretty bad (e.g. Mastodon servers won't backfill posts so you won't see any history).