Facebook and Twitter were all the rage in 2009, and not just for social networkers. The sites were also extremely popular among hackers and thieves, IT security firm Sophos revealed Monday in its Security Threat 2010 report.  Computer users are spending added time on amusing networks, sharing sensitive and valuable personal information, and hackers have sniffed out where the money is to be made,” said Graham Cluley, chief technology consultant for Sophos. “The dramatic rise in attacks in the aftermost year tells us that amusing networks and their millions of users have to do add to protect themselves from organized cybercrime or accident falling casualty to identity-theft schemes, scams and malware attacks.” Cluley did call for Facebook to make some changes, however. "There is no doubt that simple changes could make Facebook users safer. For instance, when Facebook rolled out its new recommended privacy settings late last year, it was a backward step, encouraging many users to share their information with everybody on the Internet." The existence of social networks makes "social engineering" -- the method of getting targets to open malware -- even more powerful. "These are the same types of attacks we've all known for some time, but now with a new dynamic," Storms said. "Simply because a message appears to come from a friend doesn't mean the recipient shouldn't question its validity. Think twice, ask questions, and don't be so quick to click."