In Video: Facebook founder Mark Zuckerberg appears before US Congress

Facebook founder Mark Zuckerberg has given evidence before US Congress about false information on the platform and its role in the Cambridge Analytica scandal.

Asked what he was doing to see how widespread the misuse of personal Facebook data was, Mr Zuckerberg said the company was investigating "tens of thousands of apps", and said affected users would be alerted if those investigations "found anything suspicious".

On the subject of fake news, Mr Zuckerberg said "one of my greatest regrets in running the company" was its slowness at uncovering and acting against disinformation campaigns by Russian trolls during the US election.