An official investigation may be about to be launched into the activities of bloggers who use the internet, Wales Eye can reveal.
One particular Welsh blogger has come to the attention of the authorities.
Royston Jones, who uses the pseudonym Jac o’ the North, is known for his outspoken views, which some experts believe could be libellous.
Now a special police inquiry is underway into possible breaches in the law generally.
The news comes as a leading lawyer, and expert in social media cases, stressed that the laws of libel apply to statements on the internet as with all other publications.
Nigel Jones of JMD Law in Cardiff is a libel lawyer who three years ago successfully prosecuted the first social media case in the UK.
Mr Jones, who examines reports and acts for Wales Eye in legal actions, said: "Twitter is a public forum, just like publishing a newspaper article or broadcasting an item on the television, and the laws of libel apply".
He said that inaccurate information which defames a private individual or organisation runs the risk of being libellous.
A police source told Wales Eye: "We are aware of possible illegal activities on social media sites based in Wales and we are investigating them."
The details are set against a backdrop of deep concern about outlets like Twitter being used by high-profile media personalities (see http://tmblr.co/ZwCEOs1BBpPpu ).
Most journalists and broadcasters ‘tweet’ to publicise their forthcoming programmes or news bulletins.
As one UK journalist told Wales Eye:"I will not put anything on Twitter which I am not prepared to broadcast."
Politicians also use Twitter to publicise media conferences and policy announcements.
But statements on Twitter from Royston Jones, who describes himself as a right of centre nationalist, are seen as different and have now formed the focus of the inquiry.
One, about a satirical Wales Eye report written by a columnist (see http://tmblr.co/ZwCEOs1PN8hdg ), is being scrutinised.
An observer who has followed Mr Jones’ work closely said: "This is the poisonous bile of a conservative - with a small ‘c’ - nationalist."
Published statements by him last year about disabled people and the paralympics have also proved controversial.
A record number of 38 Welsh athletes were selected for team GB in the 2012 paralympics, winning 14 medals.
More than 100 Welsh athletes were given an official send-off in Cardiff bay, before the Special Olympics at Bath, which takes place every four years and is designed for people with learning difficulties.
The equal treatment of disabled people is viewed by commentators as a progressive mark of advanced countries.
But one of the lines by Mr Jones which caused particular offence was: "Am I alone in thinking there’s an element of a Victorian freak show in the Paralympics?”
A post on the Republic website concluded: ”(He was) awarded … that week’s Full of Shit award.
"It was well merited (as this was a) primitive attitude to disabled people.”
He has also written about the Russian feminist punk rock band, Pussy Riot using phrases which have alarmed some people.
Three members of Pussy Riot were jailed in August 2012 for "hooliganism motivated by religious hatred" and were sentenced to two years in jail after performing in a church.
Now a huge range of Twitter comments are to be examined by the police.
It is believed some may be in ‘contempt’ of court cases that are in progress.
In December the attorney general, then Dominic Grieve, issued legal warnings to ensure Twitter users did not make prejudicial comments that might force trials to be abandoned.
The attorney general’s office issue about five advisory warnings a year a year although there were 10 last year due to high-profile court cases.
These have now been put into formal guidance.
At the time Mr Grieve said: "Blogs and social media sites like Twitter and Facebook mean individuals can now reach thousands of people with a single tweet or post.
"This is not about telling people what they can or cannot talk about on social media.
"Quite the opposite in fact – it’s designed to help facilitate commentary in a lawful way."
Advisory warnings were circulated last year in relation to cases such as the murder of Tia Sharp, the court martial of Sergeant Danny Nightingale and the arrest of Christopher Jefferies in Bristol.
Broadcasters like the BBC have their own social media guidelines, although these are not always followed.
Perhaps all bloggers should have them.