One definitely strange thing that we are not used to about the mastoverse is the possibility that they have to change the "type of envelope" in the middle of the conversation.
Example: in a public post, in which you participate with a comment, a person responds to that comment of yours using a DM, and, when we respond to the DM, in any case our response is public and not private. I'm not sure what the solution could be for this type of problem.
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Giac El Vecio