"When Liese Stanley saw the messages that her then 13-year-old daughter had received on the social network Ask.fm, she felt sick with shock. This wasn't normal bullying. Her daughter wasn't being called too fat or too thin, or criticised for her choice in music. She was being threatened with a sadistic rape attack. Her abuser also threatened to attack the schoolgirl with a hammer "to cave in the back of your head".

Stanley's story is almost certainly not unique. This week Ask.fm has faced a barrage of criticism for failing to tackle cyberbullying on its site after the suicide of 14-year-old Hannah Smith."

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