Facebook, Google and Twitter are introducing stricter rules, altered algorithms and thousands of fact checks to stop the spread of bad misinformation online about the virus.
Attorneys general from 48 US states along with Puerto Rico and the District of Columbia are investigating whether Google's huge online search and advertising business is engaging in monopolistic behavior.
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.
The tough new legislation will be brought to parliament next week as Canberra pushes for social media companies to prevent their platforms from being "weaponised" by terrorists in the wake of the mosque attacks in New Zealand's Christchurch.
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