The El Paso shooter along with the gunman accused of killing 51 worshippers at a New Zealand mosque and the man accused of terrorising a synagogue in Poway, California, all posted hateful screeds on 8chan before committing their crimes.
Authorities and experts expect fatal attacks to continue escalating amid an uptick in white nationalist rhetoric.
The message board was effectively knocked offline after two companies cut off vital technical services following the mass shooting in El Paso, Texas, whose perpetrator posted his manifesto on the site.
Cloudflare CEO Matthew Prince describes the no-censorship site as "a cesspool of hate." Right-wing extremists, misogynists and conspiracy theorists freely post to 8chan, which does not moderate content.
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