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.