Biden spent more money on advertising than any other US presidential election candidate.
Facebook's move to allow voters to block political advertising could be harmful to democracy.
"Our narrative is to really show content publishers that we're their ally."
Google and Twitter have both made moves to stem lies in political advertising.
Singapore's opposition political group said the "shocking" move would deprive voters of information ahead of the looming election.
The new policy will be enforced ahead of the UK's general election and the 2020 US election, and in the rest of the world in January.
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