Charlotte Gallagher

The case, one of more than a thousand waiting to be heard, was brought by a 20-year-old woman identified only as KGM or Kayleigh in court, along with her mother, because they claim her obsessive use of platforms like Instagram and YouTube from the age of six exposed her to harmful content.

From the witness stand, with Kayleigh sitting opposite, Mark Zuckerberg launched his defence of Instagram.

He was shown internal meta emails from a decade ago that referred to specific company goals, including time spent increases by 12%.

He said the company used to give time as goals, but that's not, he said, how we run the company now.

He added when there's something of value, people tend to use it more.

Laurie Schott's 18-year-old daughter Anna Lee took her own life after her mother says she became addicted to social media, Instagram in particular, using beauty filters and becoming obsessed with the way she looked.

The trial is being watched closely as a test case, with many more people preparing to take similar action to, as they see it, hold the social media companies accountable and change the way they operate.

That was Peter Bowes.

still to come in this podcast.

I'm OK, probably just a little bit embarrassed.

I shouldn't have had a drink, and especially in these conditions, it's not the standard that I set for myself.

The Australian TV reporter who got caught up in the Winter Olympics festivities, but has the backing of the Prime Minister.

But what's happening in America isn't just a cause of global upheaval.

It's also a symptom of disruption that's happening everywhere.

I'm Tristan Redman in London, and this is The Global Story.

Listen on BBC.com or wherever you get your podcasts.

Now to the story of a tragic death on Austria's tallest mountain that could change how the law there judges the obligations people owe each other.

That's after a man left his girlfriend behind during bad weather and she died of hypothermia.

Evan Davis spoke to Severin Glaser, a professor of criminal law at the University of Innsbruck in Austria, about what happened and who could be formally held to blame.

They made a couple of mistakes in the preparation.