In my own personal opinion, these fearmongering reports are the biggest scam of all. Even the BBC is only reporting this based on information from Symantec, and that's S.O.P. for the antivirus company: a) release a report that claims everyone is in danger and that viruses are everywhere, b) get some less-than-tech savvy journalist to believe it, and c) sell copies of your antivirus software and profit. In reality, if you click links only on trusted sites and keep an eye on everything coming in to your Mac, you don't need Symantec to tell you how to be safe. If you install "security software" that you happened to pick up while searching for iPad news, of all things, then you can't be surprised when your system gets compromised.