4chan, which was created in 2003, claims it receives 22 million unique visitors a month, half of whom it says are in the United States.
While the site hosts forums on a variety of topics — including video games, memes and anime — and says it has rules against racism, its lax approach to content moderation means that hate speech not allowed by more mainstream platforms spreads more freely on 4chan.
4chan is part of the internet’s Wild West. While Big Tech platforms like Facebook and Twitter at least try to police their sites, almost anything goes on 4Chan. Some parts of its forums are almost exclusively dedicated to the sharing of racist and antisemitic memes and tropes.
Immediately following the Buffalo shooting, some users on 4chan did not discuss the horrific loss of human life but instead shared methods for reuploading the shooting video so it could be seen by more people.
Twitch, the Amazon-owned service on which the shooter had livestreamed part of the attack, said it removed the video for violating its policies two minutes after the violence in the video began. The actual live stream itself had only been seen by a small number of people, perhaps as few as 20 or so, according to screenshots that have circulated of the stream.
4channers who had apparently screen-recorded the live stream discussed tactics for re-uploading the video to other sites, and services that could be used to hide their identity as they did so.
Platforms like Facebook and Twitter banned the sharing of the video on their sites, but the companies were clearly struggling Sunday to contain its spread.
The preservation and sharing of these videos by far-right communities on 4chan and other fringe message boards can help inspire further bloodshed, according to Decker, as evidenced by what the Buffalo suspect wrote in his alleged document.
CNN has reached out to 4chan for comment.