Twitter has been criticised for not policing online trolls
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Twitter may have to explain why abuse is not 'policed'

30 July 2013 Last updated at 18:34 BST

Twitter executives could be asked to appear before MPs after their social networking site was used for a new wave of online abuse.

Several prominent women, including one who campaigned for a woman to appear on the new £10 note, have received violent and sexually explicit messages.

Reeta Chakrabarti reports.