A 32 year old from Bristol has been arrested on suspicion of penning a series of abusive tweets directed toward a Labour MP on the micro blogging service.
Stella Creasy rose to prominence after being barraged by a flurry of abuse from anonymous individuals on the social networking site, spurring wider calls for more robust policing of online environments.
The unnamed individual was questioned by detectives investigating threats of rape and physical violence under the Protection from Harassment Act.
Scotland Yard’s e-crimes unit are said to be investigating eight people on the site and forced Twitter to beef up its security measures.
Recipients of threats in recent days include Ms Criado Perez, who successfully campaigned for a female to be represented on £10 banknotes, and journalists Hadley Freeman, Grace Dent and Catherine Mayer.