Scams aren’t always totally obvious. Cybercrooks have been using more “signed” malware, malicious files that imitate files or sites your trust and the even more prevelant “friendly fire,” messages from friends containing viruses disguised as invitations to social sites.
A recent example is the ShoppyBag scam, an e-mail notification alerting you that a photo of you has been tagged online, prompting users for account information that immediately leeches onto your e-mail account and sends out invitations to your entire contact list.