SummaryCompaniesMusk's X says it will comply, final platform to agreeAustralia first in world to ban social media for under-16sTen major platforms ordered to block children or face fineEU lawmaker says Europe has a chance to learn from AustraliaSYDNEY, Dec 10 (Reuters) - Australia on Wednesday became the first country to ban social media for children under 16, blocking access in a move welcomed by many parents and child advocates but criticised by major technology companies and free-speech advoc...