LONDON, June 14 : Britain is expected to set out restrictions on social media for children under 16 on Monday that could include banning popular platforms and features that are deemed too addictive for the wellbeing of young people online. Britain has increasingly toughened its approach to tech companies in recent years, urging or forcing them to impose age verification, adapt their algorithms and, most recently, prevent children from circulating nude images taken on mobile phones. But with a