Twitter has always, to my knowledge, called them DMs. I’ve always hated FB messaging, despite using it out of necessity occasionally, so I can’t speak to if/whe

Twitter has always, to my knowledge, called them DMs. I’ve always hated FB messaging, despite using it out of necessity occasionally, so I can’t speak to if/when the naming scheme changed there. That said, a bunch of smaller messaging sites made that shift, so your core point is valid, I just think you overshot with your examples potentially.