My friends and I used to visit the *chan sites when we were younger. Sometimes the discussions there were good e.g. if you browse the exercise forums.
But then one of my closest friends killed himself silently. That was when I realized that these sites are no jokes. Some of the people there have fallen so deep into the pit of hate and depression. Nowadays I don't even link nor share the name of the sites to my younger friends where I see the early signs of hate growing. My personal belief is that all of this is happening due to a lack of a proper father figure for boys growing up, making them socially illfit, making them outcasts and making them blame everything on immigrants and so on when they can't find a girlfriend or friends.