I am 30 years old dear Osiris and it's true that I don't go clubbing ever. And here in Turkey, indeed it started right after that specific group selfie shot during the Oscars became viral. I thought the situation was the same everywhere else, but obviously it is a deeply-rooted pop culture element elsewhere. Also note that those selfies aren't specifically clubbing photos. In fact, I see those taken not in clubs but anywhere else in my case.
Btw, I think Apsod means "those guys are late to catch up with the trend" when he says "late to the party".