A new high-tech and ultra-modern front was opened in the battle over hunting last night, after a leading animal welfare campaign group launched an interactive map instantly logging every complaint made.

The League Against Cruel Sports said it could finally reveal the "murky world of hunting" with a new service, fed in real-time by people using the Twitter service.

Each one is categorised as either 'hunt havoc', 'hunt police' or 'hunt crimewatch', depending on whether the hunt had trespassed into people's gardens or stopped traffic, been reported to the police for allegedly hunting illegally or simply been spotted in the countryside.

But last night the hunts being targeted in this way were outraged by the move – and accused the league of simply making up the complaints to make it seem as if the controversial Hunting Act was working.

The League's online Huntmap service yesterday showed virtual 'pins' in a map of Britain, with a concentration on the West Country where the bulk of anti-hunt monitoring takes place.

Some verified cases of hunts causing problems – including the incident last month when hounds from the Vale of the White Horse (VWH) hunt strayed onto a railway line on the Wiltshire-Gloucestershire border – are included, while others are far more vague.

The league said the launch was to mark the sixth anniversary of the Hunting Act and to give people the opportunity to report suspicious activity.

"By harnessing the power of social networking site Twitter, we will plot incidents of suspicious or illegal hunting as well as hunt havoc reported through tweets onto a map of Britain. The League has over 7,500 followers on Twitter," said the League's chief executive Douglas Batchelor (pictured right).

"This time last year the hunters were claiming the law which curtails their bloodsport wouldn't reach its sixth anniversary yet here we are.

"The truth is that there is simply no appetite to repeal an Act which would turn the clock back to cruelty and allow hunting of wild animals with dogs.

"The public wholeheartedly support the Hunting Act and we will continue to celebrate its anniversary for years to come," he added.

But the Countryside Alliance said it was verifying each report in turn and discovering many were 'bogus'.

"This is a case of trying desperately to shore up the failed Hunting Act and make it look as though it is working," said a spokeswoman.

"We have contacted many of the hunts alleged to have caused this 'havoc', and many of them were either not out on those days, or nowhere near the vicinity of the alleged 'havoc' at the time it is meant to have happened.

"Desperate stuff, but then the league was the architect of the Act so is trying to make it look successful. There has been one successful conviction of a registered hunt for every year of this Act's life – six. Hardly havoc, and certainly not worth boasting about.

"We would suggest that the real menace here is insinuating law-breaking where there is none and wasting everyone's time. The Hunting Act has failed and the campaign for repeal stands.

"Our hard-working huntsmen should not be painted as villains in this way, this whole 'campaign' is pure fantasy," she added.