It was meant to be a hearing about the libra cryptocurrency, but last week’s appearance before a committee of the US Congress quickly turned into a grilling for CEO Mark Zuckerberg.

"In order for us to make decisions about libra, I think we need to kind of dig into your past behaviour and Facebook’s past behaviour with respect to our democracy," congresswoman Alexandria Ocasio-Cortez said, before asking: "Mr Zuckerberg, what year and month did you personally become aware of Cambridge Analytica?"

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