It's a forum site, just like this. With threads etc and different sub-pages. Instead of all the different teams' forums, they have /b/ (random), /pol (politics), etc. It's like a NSFW reddit for with way less rules. aka no rules.
Most of it there is just trolling and posting sexting pics, with the most commonly frequented (and infamous/famous) being /b. It's all usually harmless chaotic neutral, really, and should be taken with a grain of salt. Until it isn't, because you can't underestimate the power of the internet.
Hilarious troll of that weird Shia protest thing
It's not all for naught though.
Anonymous seized the KKK's webpage once