Someone can write a dissertation about 4Chan, and probably has. Everybody who has roots in the "internet culture", whatever that constitutes, has spent some time on 4Chan, but I don't know anyone that was around back in the day that's still around on it. Maybe it's always refreshing. It'd be interesting to see what the ebb and flow is like.
On the flip side of this, people used to make joke posts on 4Chan all the time about committing suicide, however I don't see how they can see someone on fire and assume it's not real.