Social networking sites like Twitter, LinkedIn, Facebook and MySpace will pose one of the biggest threats in 2010, according to TriGeo Network Security, a provider of security information and event management (SIEM) technology for midmarket enterprises. According to the Identity Theft Resource Center, the number of data breaches in 2009 is on track to drop by nearly 50 percent when compared with 2008. Two more American states will pass data breach laws.