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That’s something people could try experimenting with. I will see if I can find out what can be done with Lemmy, regarding Peertube and Mastodon. But I would asume that not all features from Masodon or Peertube would translate smoothly to Lemmy strictly because it’s a different software with a different focus.
Federation just means you can communicate with users from another server. Even if it’s a different ‘platform’ like Lemmy to Misskey, Mastodon to Peertube.
People should realize though that Red Note has actually been around since 2013 and is not a new app. WHat might be new is their owners may be more dedicated to replacing TIktok due to what been happening to TIktok in the u.s of late.