I feel like they killed my son. That's how I feel.

Jennifer Mitchell had no idea. Her son, Ian, kept a secret.

I keep his ashes in here.

Ian didn't tell her about the graphic videos he saw on social media about Russian roulette. She only found out after he died, killed by a single gunshot.

How do you feel about the tech companies and whether they're taking their responsibilities to children seriously?

They're not. It's all about the money. It's not about the kids.

Now, Jennifer, along with hundreds of other parents, is suing the social media companies she blames for Ian's death.

To me, it just feels like justice for my son. But at the same time, I feel like I could help other people. It's like if somebody else did not have to go through my experience, then I think I did something good for the day.

Hello? Is that Jennifer?

Today, she's sharing her story across the Atlantic with Ian, Molly Russell's father.

I don't know, kids are dying every day.

It's so grim, isn't it?

Yeah, it really is.

Molly was just 14 when she ended her life. Her inquest revealed a stream of dark, depressing, graphic material which flooded her accounts and shone a light on the inner workings of big tech.

We should not be sitting here. This should not happen because it does not need to happen.

The coroner decided Molly died while suffering the negative effects of online content. Those revelations in a small court in North London also made a huge impact across the Atlantic in the US Capitol.

Lawyers here in Washington watched the inquest via video link for any evidence that could help them as they sued some of the biggest tech companies in the world on behalf of hundreds of children and families in the US who claim the platforms caused them harm.

I think it was a really important watershed moment. Anytime you have someone stand up and actually fight back and win, it shows everyone else that it's possible.

The tech companies say the claims are unfounded and they'll robustly defend themselves. But across the US, more and more people are joining the action. In Colorado, feeling like a survivor, Taylor Little.

All of our stories are the same. Molly Russell, especially. I feel incredibly lucky to have survived it, and my heart breaks in ways I cannot even put into words thinking about people like Molly. That was my second suicide attempt, and I was finally able to get real long-term treatment. I spent hours and hours and days and days. Just reading about suicide on social media. It took my life from me. I literally was trapped by addiction.

A landmark court case then, but also a very personal battle to hold social media to account.

All hope I have for a better social media is entirely dependent on us winning and forcing them to make it because they will never, ever, ever choose to. They will choose money every time. Every time. That's so funny. That's so funny.