2channel (2ちゃんねる, ni channeru. Known as 2ch for short.)
A Japanese internet forum, often thought to be the largest in the world. It has over 600 boards covering a wide range of topics, as their slogan (From "hacking" to "side dishes for tonight's dinner") would suggest.
2ch plays a large part in Japanese internet culture and has created a culture and language in and of itself. ASCII and Shift-JIS art is popular there and many meme/neta and characters have been created based on it. In addition, several internet celebrities have been born there, as have many collaborative projects and pranks (ie: Densha Otoko, Buront, Kasane Teto and the Vippaloids.)