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Surely how pleasant a site is must correlate to how much moderation and anonymity its users experience.

Yeah, because Reddit has turned out great, hasn't it? /s

I'm sure most would agree Reddit is much more pleasant than 4chan.

It really depends on the subreddits and their mods.

A huge split is always created: sites for left wingers (usually very moderated) and sites for right wingers (usually more free).