The carbon tax has been branded 2012's biggest public relations disaster after an analysis of public reaction on social media and mainstream news sites.
And 2Day FM's prank phone call, which preceded the death of British nurse Jacintha Saldanha in December, was labelled the year's third worst PR mistake.
The results were compiled by self proclaimed "PR watchdog" prdisasters.com and online analytics firm, cyberchatter.com.au.
The results were calculated by monitoring and analysing public reaction on traditional and social media sites to the various news events.
"To qualify as a PR disaster the incident must result in sustained, negative media coverage for the brand, business or person at the centre of the story," a spokesman for PR Disasters said.
It is the company's third annual report.
Carbon pricing began in July 2012, but only after months of heated political debate and Prime Minister Julia Gillard's well-publicised claim that she would not introduce a carbon tax.
"Arguably Julia Gillard's most unpopular decision since her time as prime minister," PR Disasters said of the decision to introduce the tax.
"This legislation caused a nation-wide uproar talked about in traditional media, online forums and Twitter."
PR expert Gerry McCusker, author of the prdisasters.com blog, said Twitter is now the website most people turn to when they want to criticise poor PR decisions.
"For the second year running, the biggest critics of PR and reputation appear to be those in the 25-34 age bracket, although the 35-49 age bracket was out in force against the carbon tax," he said.
The January 2012 Tent Embassy riots in Canberra also made the list.