Mark Zuckerberg this week doubled down on his decision to allow unchecked political advertising on Facebook, even though pressure intensified for him to ban it following Twitter's decision to do so.

Some say that by allowing even political adverts which contain falsehoods, the Facebook chief executive is putting profits ahead of protecting US democracy. Elizabeth Warren, one of the Democratic frontrunners for next year's presidential elections, has called Facebook a "disinformation-for-profit machine".

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