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No, that’s because social media is mostly used for informal communication, not scientific discourse.
I guarantee you that I would not use lemmy any differently if posts were authenticated with private keys than I do now when posts are authenticated by the user instance. And I’m sure most people are the same.
Edit: Also, people can already authenticate the source, by posting a direct link there. Signing wouldn’t really add that much to that.
Too bad that’s based on macros. A full preprocessor could require that all keywords and names in each scope form a prefix code, and then allow us to freely concatenate them.