British charity NSPCC said the number of children who are victims of hate crime has risen by 20 percent since 2016.
The content featuring children racked up more than 1 million views by the time Instagram acted.
The social network said it had stopped sharing the survey among users.
The NSPCC has warned children risk "being stripped of their childhoods."
A Canadian documentary reveals the methods the group use to lure teenage girls to travel to Syria.
In a letter to Theresa May the victims said the current inquiry was 'not fit for purpose'