‘Poisonous’: how WhatsApp is exposing UK school children to bullying and harmful content

Teachers say they are powerless to deal with damaging elements of social media and are calling for more parental vigilance

Victoria Tully, co-headteacher at Fulham Cross girls' school, a state secondary in west London, had no idea that her new first years had invited people from outside the school to join their WhatsApp group.

She only found out when a strange man" shared horrible pictures" with the 11-year-olds and someone alerted a teacher.