By Matthew Lesh Social media is an easy target for society’s woes, but there is little hard evidence for its link with bad mental health, writes Matthew Lesh A new book has ignited debate on social media this week. It is perhaps appropriate that the book, The Anxious Generation, is itself about social media. Author Jonathan Haidt, a high-profile social psychologist, argues that childhood development has been disturbed by replacing play and in-person socialising with screen time, driving a youth mental health crisis. This book will undoubtedly bolster the campaign from those aiming to ban socia…