Broken careers, ruined reputations, jail-terms, bullying, and virtual war. Exactly when did Twitter become an exercise in causing as much mayhem as possible in 140 characters or less?
The wildly popular micro-blogging service, more than 500 million users and rising, has recently crossed the line from reporting on the news to causing it.
And while it is greatly enjoyed by millions, the free-for-all, virtually unregulated world of instant global communication now appears to be spinning out of control, causing serious problems for the traditional media, celebrities, politicians, sports stars and ordinary users.
From spreading outrageous libels linking politicians to high-profile child-abuse cases to identifying victims in sexual assault cases in a number of instances, still before the courts, Twitter has increasingly become a tool – in the wrong hands at least – for causing havoc.
A big part of the problem is that social media allows people to broadcast offensive, illegal or in many cases, incredibly stupid behaviour to the world.
Just this month alone, a man was arrested in Kent in England for tweeting a picture of himself burning a Remembrance Day poppy while another English police force is investigating death threats tweeted against Republic of Ireland footballer James McClean because of his refusal to wear the poppy on his jersey when playing for Sunderland.
Elsewhere on social media, the wife of the Speaker of the House of Commons in the UK, Sally Bercow, had her high-profile Twitter account suspended after reportedly naming a young woman at the centre of a child abduction case.
This followed another case where police arrested and charged two people who had used twitter to name a woman who was raped by former Welsh international footballer Ched Evans.
In the case of Ms Bercow, she had also been amongst the thousands of Twitter users who wrongly named, or linked, former senior Tory Lord McAlpine with child abuse claims, an incident which could lead to the biggest libel case in UK history, with lawyers for the politician threatening to go after up to 10,000 Twitter users after their current affairs programme Newsnight erroneously claimed a top Tory politician was implicated in a paedophile ring.
After being warned that she could be amongst those targeted by lawyers representing Lord McAlpine, Bercow tweeted to her 57,000 followers last Sunday night: "Thanks for phone calls/texts/tweets. I guess I'd better get some legal advice then. Still maintain was not a libellous tweet – just foolish."
However, the wife of the Speaker, who might be expected to know better given her husband's high- profile job in politics, then tweeted about an ongoing child-abduction case and is now part of an investigation by the Sussex police force into "potential criminal breaches" of reporting restrictions designed to protect victims.
Both Sky News and the BBC (which has been rocked by the fallout from the McAlpine case) have just introduced strict new guidelines for journalists using Twitter.
The BBC has warned its journalists not to break stories on Twitter without first running them past their editors while Sky News has gone further and banned their reporters from re-tweeting news or opinion from any Twitter users who are not employees of Sky News.
It is not just broadcasters who are facing problems with Twitter. A growing number of businesses and high-profile companies have also seen the downside of social media.
Just this week, the UK loan company Wonga had to apologise to Labour MP Stella Creasy after one of their employees used an anonymous Twitter account to launch a highly abusive and personal attack.
Creasy has been a very vocal critic of fast-loan companies such as Wonga, calling them "legal loan-sharks".
The Thirst Project charity had no idea why it became the target of an avalanche of hate tweets from Bieber fans around the world. These were sent directly to the Charity via Twitter and included such sentiments as "@ThirstProject who wants to help those jungle bunnies anyway?" and "@ThirstProject – Justin Rules – Your (sic) retarded nobody likes you".
It turned out that another tweeny star, actor Drake Bell (who has had a bit of a spat with Bieber) had endorsed Thirst Project.