Not to be taken lightly, the threats to the Internet that are perpetrated by organized criminals and other deviate sources have become another landmine in the web.
Most of us experience little if anything until we bump into an event. And most often that is when our guard is down: antivirus or malware protection has expired, or we venture into areas of the Internet with higher connection to the dark side. Email is another source of trouble.
“Anonymous hacktivists, cyber criminals and nation-states are viewed as the top three threats in 2012 and more than 60 percent of those surveyed believe that they will be the target of a cyber-attack in the next 6 months. ”
You might want to take a look at a recent survey from Bit9 that provided the above quote, although I am not familiar with the author or the research methodology employed.