Should Employers Block Social Networking Sites?

"A new study out today shows that 43.9% of companies block MySpace, while 25.6% block Facebook. In the early days of social networking, it’s safe to say that most people who were sneaking onto social networking sites during the workday were doing so to goof off. But with companies now using social networks for legitimate purposes (see: Facebook Pages), should employers be restricting usage? The Daily Poll asks..."