Zuckerberg testimony: Facebook CEO grilled by Congress over data misuse –as it happened

Mark Zuckerberg gives testimony to Senate committees in light of revelations that Cambridge Analytica used Facebook data to influence US voters

• 'A positive force': read Zuckerberg's prepared testimony
• Facebook and Cambridge Analytica face class action lawsuit

12.28am BST

Thanks for following along with our live coverage of Zuckerberg's trip to Congress. If today's five hours of Zuck weren't enough for you, tune in tomorrow morning for Round Two: The House of Representatives.

In the meantime, you can read my colleague David Smith's full report on the day here.

12.24am BST

Thune is closing things up by again bringing up concerns about conservative bias, and asks Facebook to err on the side of allowing speech.

Grassley jumps in to say that he spoke with another CEO of another platform yesterday who admitted to him that he was a liberal. Grassley is kind of rambling about media bias and partisanship.