Facebook, Google and Twitter grilled by Congress over Russian meddling – as it happened

The tech giants went before Senate judiciary committee to explain how and why Russian operatives were given free rein to tamper with 2016 US election

• Russia-backed Facebook posts reached 126m Americans during election
• Mark Warner: senator ready to take tech giants to task

9.40pm GMT

We're going to wrap up our coverage of a senate panel questioning representatives of Facebook, Google and Twitter.

Here's what we learned:

9.00pm GMT

The tech reps are done. There's a second panel featuring Clint Watts of the Foreign Policy Research Institute and terrorism analyst Michael S Smith.