The metaverse is a term coined in the dystopian novel "Snow Crash" three decades ago and now attracting buzz in Silicon Valley.

Human rights groups have voiced concerns that the Taliban could use online platforms to track Afghans' digital histories or social connections.

Facebook had on Monday said it designates the Taliban a terrorist group and bans it and content supporting it from its platforms.

Under Facebook's policies, it appears that after Biden takes office in January, Trump's posts would also no longer be exempt from review by Facebook's third-party fact-checking partners.

Twitter users will get a prompt from next week pointing them to credible information before they can retweet content that has been labelled as misleading.

The post contained a video clip, from an interview with Fox & Friends, in which Donald Trump claimed that children are "almost immune" to COVID-19.

The eldest son of US President Donald Trump posted a since-deleted tweet on Monday with a viral video of doctors talking about the drug hydroxychloroquine.

Prior to the event, Trump's campaign manager Brad Parscale said there had been more than one million requests to attend.

The ads showed a red inverted triangle, a symbol the Nazis used to identify political prisoners, with text asking Facebook users to sign a petition against Antifa, a loosely organised anti-fascist movement.

Political groups and marketers say the idea is that voters have a more trusted connection with micro-influencers than with celebrities, reaching out to the specific local and niche communities.

Facebook said it should not be the arbiter of 'acceptable speech' in the political arena.