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Re:The origin of “tweet” at Twitter (2013) by nkozyra on Wednesday May 05, 2021 @06:05PM (#27056419)
They're also known as "Personal" Messages
Re:The origin of “tweet” at Twitter (2013) by simlevesque on Wednesday May 05, 2021 @06:15PM (#27056505)
Never heard this before, but personal seems like another word for private in this case.
Re:The origin of “tweet” at Twitter (2013) by nkozyra on Thursday May 06, 2021 @07:07AM (#27061494)
From Wikipedia:

"A private message, personal message, or direct message (abbreviated as PM or DM) is a private communication channel between users on any given platform. "

They are all private in terms of intended recipients. They're not cryptographically protected.