Social networking site Twitter has clarified its rules on abusive behaviour amid an increasing backlash over so-called "trolls".
The company has updated its rules to make it clear that abuse will not be tolerated, and has put extra staff in place to handle reports of abuse, it said today.
Stella Creasy was targeted after giving public support to a feminist campaigner who had herself received such abuse on Twitter
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Peter Barnett made hundreds of trips from his home in Oxfordshire to Marylebone station without paying the full fare.
Police say he may have attacked more children and urged them to come forward.