The wisdom of the street smart.

I wonder what's app's does japanese people in their 20's might use. Like what is the reddit equivalent for them where they ask ananymously questions to strangers. What would be the news apps. Where online do they fight over politics between right wingers and left wingers and everything in between them. Also where do they spread political / geo-political propaganda the most. And where do they debunk the same propaganda I wonder.