Is the DM button called “Privately mention”? Or is that something else?
correct.
when composing a message you can also set the visibility to whoever is mentioned in your message exclusively:
those messages aren’t encrypted, as stated on the banner above
Yep. A “private” message where the recipient is listed in the message is a DM in Mastodon. It will only be delivered to the mentioned person.
In addition to what others have already pointed out, please also note that mentioning any other account in a “private” message chain will allow that account to retroactively see all the messages in the chain.
Basically DMs in Mastodon are pretty useless.
https://github.com/mastodon/mastodon/issues/24837
I think so, and I agree that it’s confusing. There’s some discussion about it here