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It was/is? a portal to the online netherworld. Gamers, programmers, edgelords and social maladepts could be and say whatever they wanted, and share whatever they wanted, just a step outside the ‘dark web’. A lot of this was unfiltered hate and illegal pornography, hence the site’s reputation as the asshole of the internet (tm).
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Before about 2008 the right wing stuff was mostly kept on a couple of sub forums,
/b/ (random) was the pinacle of shit posting and some of the more specific forums were actually useful. I bet if you went on the weight lifting one now you'd find a helpful guide stickied at the top about weekly routines, nutrition etc. Over time it got taken over by bots. But also I was a teenager in it's peak, it was a lively place where memes were created and funny things happened. Sure there was some racism, gore, etc but growing up on the internet you learn to filter that.
I don't need no documentary, I was on 4chan at the time it became a thing.