As funny and informative and interesting as that video was, you have to know that a significant amount of 4chan is... adult? I have to describe it somewhat as Ebichu was described to me: It's not porn (though some of it is, in this case), but it's not something you would want your mother to walk in on you watching.
So, who else here spends time on 4chan? What boards? I'm mostly around /b/, with some time /po/, and other boards as friends send me links.
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I'm usually on /t/ and /gif/, though my favourite board is /w/.
Before I used to go to /co/ a lot, but that wore off. Oh... and /hr/ is awesome, but they rarely have images I want there.
I find /s/ REALLY annoying. Don't ask why.
When i get bored and have nothing else to do, I poke around on other boards.
I try and avoid spending too much time there, and pretty much just visit when I'm waiting for something to finish, or am bored.