It's also changing. I only really started regularly seeing random (not artistic) graffiti around 2010... and that's after visiting for almost 20 years. Certainly, I've known about poverty in Japan (mostly seen in Tokyo) since the late 90s and 2000s bust. The late 80s boom/bust priced a lot of people out of housing and they've been slowly cut out of the workforce as well.
The kids really started changing in the 90s and by the 2000s a lot of the creatives were wearing t-shirts and tennies to work, which was a huge change (although some traditional places still wear uniforms today). They've (as a cohort) changed some of the norms of work and life (not getting married or having kids!), but have also hidden themselves in weird little sub-cultures (anime, videogames, shopping, karoshi).
I should know what's going on in Japanese social media, but I really don't. Anyone have comments on that? It can't be as weird and twisted as Korea.