Millennials certainly seem more willing to openly discuss salaries, which is a promising trend. I've also noticed that people in NY are much more eager to discuss specific salary numbers than people in SF.
Rent was a hot topic in SF in recent years because costs skyrocketed, so it was actually talked about a lot. I live in NY now and I haven't noticed people talking about rent as much. But I can give you a ballpark figure (if not an exact figure) of how much most of my friends here earn, even though I have never once asked!