"The authenticity of the post was strongly questioned, both by academics and in online comments. Media manipulation experts warned that online hoaxes are extremely common in the wake of mass murders, particularly when it comes to stories involving 4chan." https://www.thestar.com/news/gta/2018/04/24/facebook-deletes-post-linked-to-alek-minassian-amid-questions-about-its-authenticity.html