More than 80 percent of websites that had been poisoned with malicious code between 2008 and 2009 were removed within 24 hours, says AVG.

The security vendor's Web Threat Profile Report estimated that on any one day between 8 and 14 million web users are being exposed to social engineering scams, such hoax Facebook pages or rogue security apps that encourages surfers to download malicious software to their PC.

AVG's chief research officer Roger Thompson predicts that social engineering scams will eventually become the most prevalent type of security threat. Thompson also said that rogue security software attacks have increased by 300 percent in Q1 of 2009, compared to the previous year.

"These dangerous web pages threaten to disrupt the very fabric of the internet as well as how we view and use it; posing an even bigger threat to users than viruses," said J R Smith, AVG Technologies' CEO.

AVG also revealed that the state of the global economy was helping to increase spam and phising attacks on the web. Get-rich quick schemes are more active on the web as hackers go in search of financial gain, said Thompson.