Do you have much experience with the chans? I've spent an embarrassing amount of time on them over the years, and my experience is that it would be ridiculous to compare the ratios of politically hateful, extremist content to normal content between Facebook and the chans. The difference is night and day. The chans are full of great, diverse content, but an absolutely solid core of their identity is inevitably dominated by the worst elements of society at any given time - it's just inevitable due to the nature of the format and rules.