A woman raped by former Welsh international footballer Ched Evans was forced to adopt a new identity after she was named thousands of times on Twitter.
Evans, who played for Sheffield United at the time of his conviction, was jailed for five years in April after being found guilty of raping the 19-year-old in a hotel room.
Nine people later admitted in court to naming the victim after the case on Twitter and Facebook and were ordered to each pay her £624.
They pleaded guilty, claiming they were unaware they had committed a criminal offence by naming her. A tenth person denied the charge and was bailed until January 21.
Singer Adele's joy at the arrival of her first child in October was soured by Twitter trolls within hours of reports emerging that she had given birth to a son.
The 24-year-old was targeted by abusive messages, including one urging her to "just murder it already". The offending account was later deleted. No action was taken.
Keir Starmer QC, the Director of Public Prosecutions, has told Daybreak that the abusive Twitter message about Olympic diving star Tom Daley was not a criminal offence, despite it being offensive.
"The message was meant for a limited audience, it was removed swiftly, other action was taken and we consulted with Tom Daley," he added.
The new Twitter guidelines, published today by the Crown Prosecution Service, come in the wake of a series of high-profile social media abuse cases during 2012.
Footballer Daniel Thomas, who plays for Port Talbot Town FC, was suspended for a game and fined £500 after posting an abusive Twitter message about Olympic diving star Tom Daley.
Mr Thomas, who later apologised, was at one point arrested over the homophobic message.
The director of public prosecutions, Keir Starmer QC, though, said the tweet was not a criminal offence, despite being offensive, and was not intended to be read by Daley.
Keir Starmer QC, the Director of Public Prosecutions, has told Daybreak that "a balance must be struck between the rights of the individual not to be threatened and harassed [online] and the freedom of speech for everyone else."
Media lawyer Paul Gilbert has told Daybreak that judges will have to decide on "whether or not a tweet itself is more than shocking or offensive."
He added: "It's finding a balance between what the law says about this and the freedom of speech."
The guidelines also state that children (under-18s) will rarely face criminal charges for offensive tweets or Facebook statuses, for example.
Also if a message is swiftly deleted, blocked by service providers or websites or shown not to be intended for a wider audience, a prosecution is unlikely.
While intended for the CPS to make a decision whether to charge someone or not, the guidelines are also designed to offer early advice to police.
The interim guidelines take effect immediately and are now subject to a consultation process.
In most cases, once you have put the (new) safeguards in place then a prosecution is unlikely to be the appropriate response. To that extent, therefore, it is to make it less likely that these cases will be prosecuted.
In summary, there is a clear distinction between four types of case: the first three to be robustly prosecuted, the fourth (offensive messages) to be treated very differently.
– Director of Public Prosecutions Keir Starmer QC
The fourth one is probably there where the more difficult decisions have been in recent months and certainly where there's been a growth in decisions. There we've put in a double safeguard: high threshold and unlikely to be in the public interest.
It doesn't mean no cases but it certainly puts in that double safeguard before a case is brought.