Hong Kong should broaden mental health support beyond high-risk students amid the growing impact of social media on young people, a government adviser has urged, as a prominent tycoon pledged to empower more young philanthropists to tackle the problem. Children who had not shown any of the usual signs of intense difficulty at home or school were taking their own lives, according to Dr Lam Ching-choi, a member of the city’s key decision-making Executive Council and the chairman of the Advisory...