Parents who have lost their children.
Overnight curfews and measures to combat 'infinite scrolling' under consideration
Here's a bit more from the statement released by the government as Starmer was speaking earlier.
The government says it will go "further than a blanket ban on social media" by blocking "harmful functions such as livestreaming and stranger communication with children for under-16s".
"These restrictions – which together with the ban go further than any other country – will apply to a wider range of online services, including on gaming sites," it says.
"Restrictions on these functionalities will also be on by default for under 16 and 17-year-olds to prevent a cliff-edge at 16. The government will also be looking in more detail at overnight curfews and breaks in infinite scrolling for under-18-year-olds and will set out more detail in July."
Ban will include Snapchat, TikTok, Instagram, X and other platforms
As Keir Starmer announced that under-16s are to be banned from social media, the government released some additional information about the ban on its website, external.
It says the UK "plans to use the same model for a social media ban as Australia".
Continuing, the statement says: "This would capture user-to-user platforms, whose purpose is to enable social interaction and which allow users to post material, alongside algorithms. The ban will therefore include platforms like Snapchat, TikTok, YouTube, Instagram, Facebook and X.
"We do not intend for messaging services like WhatsApp and Signal to be included in the social media ban."
Starmer is a 'human being' who has tried to 'understand', says bereaved mother
After the statement from Keir Starmer, BBC Breakfast has been getting the reaction of bereaved families.
Lisa Kenevan says her son Isaac, who died aged 13, has been her "driving force" as she campaigns.
She said she feels the prime minister has been a "human being", who has tried to "actually understand how it's affected everybody".
"Obviously on my personal journey, I've just been fighting for a long, long time," she says, adding she is pleased "to hear him actually have listened, collated information".
While parents "wanted it a lot sooner", Lisa says "the reality is... it's going to take time, it's not going to be perfect". She adds: "We're in a good place now".
'Parents need support' to manage children's social media exposure
Before the prime minister made the social media ban announcement, BBC Breakfast was hearing from a panel of bereaved families and campaigners.
Ellen Roome, mother of Jools, who she believes died after an online challenge, said she really hopes the announcement includes "really strong age verification" for platforms, and that it includes game sites as well. "I think all of us feel a bit wobbly" ahead of the PM's announcement, she says, calling it "so important".
Esther Ghey, mother of murdered teenager Brianna, said this "massive turnaround" was due to the work of campaigners, but also those who filled in the online consultation". She said "parents need support", adding that campaigners have been saying it for "so long" and now have the "backing of parents across England".
Regulation will pass before Christmas and ban will come in by spring 2027, PM tells BBC
Keir Starmer, dressed in suit at podium in Downing Street
Starmer is now taking questions from journalists gathered in Downing Street.
The BBC's Zoe Kleinman asks when the ban will start, how it will work and what he'll do if one of the bigger platforms decides to leave the UK.
Starmer says powers have been taken to ensure the government "can move at speed".
"We hope to pass regulation before Christmas," he says, adding the ban will therefore come into place early next year.
PM 'not prepared to compromise' on safety of children
Before moving on to questions Keir Starmer said:
"I want this message to be heard loud and clear. I am not prepared to compromise on the safety and happiness of our children, and that is why this ban must happen, and why this ban will happen."
Starmer added "it won't be easy" and that some tech companies want people to think things are "unchangeable".
"We have to resist that kind of learned helplessness," he said.
"We have agency", Starmer said, adding that the government "can" and "will" change things.
"Yes it's hard" to legislate for, regulate and enforce but that's why the government "listened to people" and learned from countries like Australia, he says, where a similar ban has already been introduced.
"We're not just bringing forward a ban" but "going further" with "world-leading action" on gaming services and live streaming platforms, Starmer said.
Changes will also tackle platforms which allow strangers to contact any child "unchecked", he added.
Ban will be 'welcomed by parents'
"In this world, with this technology, it is hard as a parent to know what to do", Starmer says.
"I think most parents will welcome this", he adds.
But he adds the government still believes it must "harness the power of technology to build a stronger, fairer Britain".
The prime minister is now taking questions from journalists in Downing Street, and we'll bring you a few more lines from his speech in a moment.
'I feel for this generation', Starmer says
Starmer says social media stops children from doing their homework, reading, playing with their friends, and going to bed at a decent hour.
"That may not sound like much, but these are activities that help a child develop into an adult," he says.
"To be honest, I feel for this generation," he adds. Thinking back to his own childhood, Starmer says children didn't have to deal with this type of technology that feeds into daily life.
Social media is making children unhappy - PM
Starmer continues, adding: "Social media is making children unhappy".
He says platforms are "making it easier for bullies to harass and abuse" children, and says this could be harmful to people's mental health.
It is "designed to be addictive" with features that "lock you in for hours", Starmer adds.
Starmer says social media is not a safe environment for children
Starmer says a full ban is the right choice and came to the decision as a parent himself.
"All I've ever wanted for my own children, hand on heart, is for them to be happy and for them to be safe, I think that's what any parent wants."
He asks if it can be believed that social media creates a safe environment for children, "I don't think I even need to answer those questions do I?"
'Clear that a full ban is the right choice', says Starmer
Starmer says he is not announcing the ban lightly, and recognises it is not "cost-free, as if social media has brought no benefits to young people".
But government is about choices, he says, and "it's clear to me that a full ban is the right choice".
.
Mind you Starmer & Reeves are giving them a good run for their money.
