Key Points

• MPs: "Absolutely astonishing" that Mark Zuckerberg refuses to appear



• EU justice commissioner writes to Facebook

• Vera Jourova gives business two weeks to answer questions



• Mark Zuckerberg has refused to appear before MPs in the UK



• Facebook's CEO will send a deputy instead



• MPs hear evidence from whistleblower Christopher Wylie

• Wylie used to work for Cambridge Analytica