4chan is the nexus of the internet, where everything goes to live and die. Especially famous for begetting the rickroll
, SHOOP DA WOOP
, and lolcat
The most famous board is certainly /b/, the random board. After that probably comes /a/, the anime board, and then maybe /v/, the video games board.
...See Encyclopedia Dramatica
for where much of 4chan goes to die.
I went on 4chan yesterday, I'm pretty sure that my brain fell out.