An image board in which jaded and cynical internet users compete to see who can be the biggest asshole.
Imagery on 4chan ranges from funny and clever, to "shocking" gore and morbid type imagery, to paedophile humour and other inanely retarted crap.
4chan users have invented their own language in an attempt to create a psuedo-culture, much in the same vein as the emo, and the lolcats people. You will typically see words like "Moar" and "newfag" plastered across the boards. Whilst those of us looking objectively at 4chan might think "Stop slaughtering the English language you illiterate fuckhole", such words are apparently used to communicate within this E-community.
Many users of 4chan are passionately defensive about the website, and often praise it as a tight knit global community and place for people to communicate whatever they want, uncensored. Others see it as a chaotic cesspit where people with no personality or ideals can vent uncreative cynicism and pretend they're clever.
Typical thread in 4chan:
User 1 posts a gif of a petite Asian girl smothering fecal matter all over her face.
User 2 responds with "Sauce"
User 3 responds with "Moar"
User 4 responds with "fap fap fap"
User 5 responds with "This is the first time i've been to this website... haha you douchebags are fucking lame as hell.
User 6 responds with "must be newfag"