SA's sweep was so wide that it encompassed both ends of the spectrum. A lot of good stuff also originated there, including the Welcome to Night Vale podcast drama series.
I know Tom Scott, known now for his YouTube videos, was on the forums (I produced a remix for a charity single he made). He's turned out overwhelmingly wholesome and level-headed.
Not in a particularly positive way. It seems like every truly awful person I've interacted with online has roots back to SA.