The British MP Stella Creasy, who has spoken out about the death and rape threats she has received on Twitter, has been tweeted a photograph of a masked man brandishing a knife, as the campaign of attacks on women who highlight online abuse continues. The latest threat comes after a series of women in the public eye exposed the threats of violence they were subjected to on the social networking site, which has called the abuse unacceptable, clarified its rules on abusive behaviour and put extra staff in place to handle abuse reports.