Is your Facebook Account "Secure" enough? Are you using https protocol? Check the Facebook URL, if the last "s" is missing go to your profile and activate the secure bowering. This infographic about Facebook Security and Spamming. You can also become a fan at our page : facebook.com/lirent.net
Even Mac OS X risk infection by viruses. Published on the website of the company, where Apple recommends its users to use antivirus. There are suggested three commercial antivirus products, perhaps remember that are also free solutions as ClamXav.