GDANSK, June 8 (Reuters) - Australia in December became the world's first country to ban social media for children under 16, blocking them from platforms including TikTok, Alphabet's YouTube and Meta's Instagram and Facebook.Below is a summary of what countries and companies are doing to regulate access to social media amid mounting concerns over the impact of social media on children's health and safety.AUSTRALIAA landmark law forced major social media platforms to block minors under 16 from December 10, 2025, one of the world's toughest regulations targeting major tech platforms.Companies that fail to comply could face penalties of up to A$49.5 million ($34.9 million).BRITAINBig tech firms operating in Britain must stop children circulating nude images on their phones or they will face legislation forcing them to do so, Prime Minister Keir Starmer said on June 8.Under the new plans, firms like Apple and Google would have to build or activate technical solutions on smartphones and tablets to detect and block nude images for children. Adults would still be able to take, share or view nude content through an age verification process.Earlier on the same day, the Times reported Starmer was set to announce a ban for children under 16 on online platforms determined to be harmful. However, a source close to the matter said a formal ban was unlikely to come that week.CHINAChina's cyberspace regulator has put in place a so-called "minor mode" programme that requires device-level restrictions and app-specific rules to restrict screen time depending on age.DENMARKDenmark said in November it would ban social media for children under 15, while parents could provide access to certain platforms to kids down to the age of 13.FRANCEFrance's National Assembly in January approved legislation to ban children under 15 from social media amid growing concerns about online bullying and mental health risks. The bill needs to pass through the Senate before a final vote in the lower house.GERMANYMinors aged 13 to 16 are allowed to use social media only if their parents provide consent. Child protection advocates say controls are insufficient.GREECEGreece is "very close" to announcing a social media ban for children under 15, a senior government source told Reuters on February 3.INDIAIndia's chief economic adviser called for age restrictions on social media platforms in January, describing them as "predatory" in how they keep users engaged online, two days after tourist state Goa said it was weighing restrictions akin to Australia's.ITALYChildren under 14 need parental consent to sign up for social media accounts, while no consent is required above that age.MALAYSIAMalaysia has begun barring those under 16 from registering accounts on social media platforms, its communications regulator said on June 1.NORWAYThe Norwegian government in 2024 proposed raising the age at which children can consent to the terms required to use social media to 15 from 13, although parents would still be permitted to sign off on their behalf if they are under the age limit.The government has also begun work on legislation to set an absolute minimum age limit of 15 for social media use.POLANDPoland's ruling party is preparing new legislation to ban social media for children under 15 and to hold platforms responsible for age verification, it said on February 27.SLOVENIASlovenia is drafting a law that would prohibit children under 15 from accessing social media, Deputy Prime Minister Matej Arcon said on February 6.SPAINSpain will push ahead with new rules to make social networks and AI safer despite intense lobbying from the tech industry, Digital Transformation Minister Oscar Lopez told Reuters in May.Prime Minister Pedro Sanchez had said in February that Spain would ban access to social media for minors under 16, with platforms required to implement age verification systems.SWEDENSweden should introduce a minimum age of 15 for the use of social media, a government-appointed commission recommended on June 2.A ban can be formulated in a way that the platforms would be responsible for age verification, investigator Lisa Englund Krafft told a news conference with Social Affairs and Public Health Minister Jakob Forssmed.TURKEYTurkey's parliament on April 24 passed legislation banning the use of social media by children under 15 and introducing new rules for digital platforms, including game software companies.UNITED STATESU.S. legislation aimed at forcing social media companies to do more to protect children and teenagers cleared a key political hurdle after Republican Senator Ted Cruz said on May 12 he would support the bill.Cruz said at an event in Washington that he would back the Kids Online Safety Act, which would require social media companies to "exercise reasonable care" in designing features that contribute to harm to minors, according to the bill.The legislation is separate from the long-standing Children's Online Privacy Protection Act, which prevents companies from collecting personal data from children under 13 without parental consent. Several states have passed laws requiring parental consent for minors to access social media, but they have faced court challenges on free speech grounds.EU LEGISLATIONOn May 12, European Commission President Ursula von der Leyen said the European Union would seek stronger protections for children from harmful social media features.Von der Leyen said the Commission would target "addictive and harmful design practices" in its Digital Fairness Act, a planned law due to be proposed later this year, while an expert panel prepares advice on how to proceed.The European Parliament in November agreed on a resolution calling for an EU-wide ban on access for children under 16 to online platforms, video-sharing sites and AI companions without parental consent and an outright ban for those younger than 13.TECH INDUSTRYSocial media platforms including TikTok, Facebook and Snapchat say people need to be at least 13 to sign up.Child protection advocates say the controls are insufficient, and official data in several European countries shows huge numbers of children under 13 have social media accounts.(Compiled by Christine Chen in Sydney, Hugo Lhomedet, Canan Sevgili, Paolo Laudani and Lucie Barbier in Gdansk Editing by Milla Nissi-Prussak, Bernadette Baum and Matt Scuffham)