Annoyingly I've used them for a number of years as a good way to make internet comments flow a bit more. However I find myself doing it less and less now because I'm worried people are just going to think I'm using an AI if they see an em dash.

(You just long press dash on android to get to it, opt+shift+dash on Mac, and the admittedly Byzantine alt+0151 on windows. Can't remember iOS off the top of my head, but I think it's similar to android)

I don't use em dashes but I do use punctuation (apparently some people find that passive aggressive and I don't what to do). When someone else uses punctuation I just ignore it unless it doesn't match their previous messages.

i use those a lot to indicate that i finished a thought rapidly (in most cases)

like "what the fu—"

I’m a fiend for a dash - they’re just better

I used to :(