Assuming that the Fourth Turning began in 2008 with the Global Financial Crisis, what are some things that belong wholly to this era? Here are some which I can think of.

1. Smartphones. Specifically, the large touchscreen form factor smartphone that made its famous debut with the first iPhone in the summer of 2007. I remember seeing people that summer that had one. They were few and far between, but they looked like the happiest people I had ever seen, delighted beyond belief with their shiny black rectangles. I got my black mirror in 2014 and I can’t imagine life without it.
2. Social media. Yes, there were social media sites back in the early 2000s. I am willing to admit that I had a MySpace page. But the big wave of near universal adoption began when Facebook became open to all adults in 2006. It was 2008 when I noticed everyone around me was joining, and I jumped right on that bandwagon. With smartphones making it ever easier to share immediate experiences, there are now multiple services in widespread use.
3. The Marvel Cinematic Universe. This one belongs squarely in the current era, as Iron Man was released in 2008. Only a few months later, the leaders of the free world were struggling to prevent global economic collapse. Things keep getting messier and messier in the real world, but in the MCU films the good guys always manage to avert catastrophe. At least until the after-credits sequence sets up the next plot twist.