1. The chief executive of Cambridge Analytica, the data firm hired by the Trump campaign that harvested information from more than 50 million Facebook profiles, was secretly filmed by a reporter as he offered to entrap politicians with women.

Above, the executive, Alexander Nix, who also said the British firm secretly campaigns in elections across the world.

Facebook’s stock has plummeted, dragging down the market, and we’re told its chief information security officer, who had urged more disclosure over Russia, is leaving the company.