The children's support service Childline has reported a surge in the number of children contacting them about online bullying.
More than 1,400 young people said they were experiencing racist bullying, up 69% on the previous year.
The charity's founder Esther Rantzen said these findings are a wake up call.
A common theme was for young people to be called a "terrorist" or a "bomber" and to be told to "go back to where they came from," Ms Rantzen said.
The 24-hour phone and online support service also reported number of contacts from suicidal young people increased by a third in a year.