4chan is a simple image-based bulletin board where anyone can post comments and share images. 4chan's collaborative-community format is copied from one of the most popular forums in Japan, Futaba Channel. Different boards are dedicated to different topics, from Japanese anime, manga, and culture to videogames, music, and photography. Users do not need to register a username before participating in the community. Feel free to click on a board that interests you, and jump right in—anyone can contribute!
Sage is what goes in the email field when one is responding to a shit post. 4chan's collaborative-community format brings about many shit posters. Users do not need to register a username before participating in the community. Because anyone can post whatever the fuck they want without any consequences whatsoever, we get a lot of asshats that post mindless shit and copypasta. Putting "sage" in the email field of a response will allow the responder to tell the poster what a retarded sack of shit they are without bumping their thread. "saging" is a form of user moderation. Abusing the sage function by "sage-bombing" is frowned upon and may result in a ban. However saging legitimately shitty posts helps to improve the overall quality of content here at 4chan. Feel free to "sage" a shitty thread any time, and jump right in-anyone can contribute!