OK, so why the verbal punctuation mark to start the Details section of a question?

Often enough, when people begin their narrative in the “Details” section, they sort of announce it by saying “Ok, so…” or “Alright, so…”. I totally get that it is a sort verbal punctuation, a preamble, a way of saying that everything that follows is important.

But it seems to be something sort of new. I don’t recall people doing it five years ago, for example. So where does that come from? Where did it originate? Is it only high school kids that do it?