He said the onus is on Twitter users to block followers, not to retweeet abuse and report offences.
She said: "It is a chicken and egg situation: women do not report offences because they know they are very unlikely to get a conviction.
West Midlands Police, one of the largest forces in the UK, will ask most victims of crime to report offences through a "self-service" website.
Nottinghamshire Police's Det Insp Martin Hillier, who led the case, told the BBC: "I cannot stress enough how important it is to report offences to the police, and to do this as soon as possible".
In some countries, the police and judiciary will dismiss women when they want to report offences, and the cost of taking a case to court can be prohibitively expensive, Serra adds.
Once again, recorded police figures may tell us something important about the confidence of victims to report offences.
9 Reasons for low police ascertainment include reliance on victims to report offences, fear of reprisals, not knowing the identity of assailants, few incentives to report, and unwillingness of victims to have their conduct scrutinised.
Sexual assault is a grievous under reported offence with detrimental physical, social and psychological effects on its victims.
Budd, Sharp, and Mayhew (2005) identified this pattern through a UK-based survey, which identified that 2% of the self-reported offender sample were responsible for 82% of all reported offences.
One reason is that 96% of reported offences stay unsolved.
They call it "cuffing", because the reported offences disappear up the officer's sleeve.
