I already learned japanese some time ago, I'm N2 in JLPT, and I must say that you are being too delusional about what the japanese sites are like. They are pretty much the same thing as the english ones, memes and reposts, marketers trying to take profit over ads and what not. It's all the same. Japanese text boards, when compared to english ones, can be a little bit more interesting, I guess, but that is just about it. There is this guy, http://vgperson.tumblr.com/, who has some very good translations of long 2chaneru threads in case you want to look at how it is in english. I personally don't see anything special in the japanese internet.