https://www.siliconvalley.com/2019/08/05/explainer-what-is-the-online-forum-8chan/

NEW YORK — An anonymous online forum called 8chan has drawn attention in the wake of mass shootings in Texas and Ohio because violent U.S. extremists have used it to share tips and encourage one another. The site suffered sporadic outages Monday after its cybersecurity provider cut off support for what it called a “cesspool of hate.”

The online message board dates back to 2013. It allows users to post graphic and extremist content and doesn’t censor posts.