Friendster, Facebook, Myspace, Youtube are some of sites usually blocked by the network administrator in your office, college or school. Off course totally dont blame the network administrator on your place. Friendship sites are good but sometimes we forget how much time have we spent all day long in front off internet just doing searching friend, send email to a friend, finding new friend or just updating your profile and other friend testimonial. Because of that reason many company restricted some sites, they marked some sites with label "unproductivity sites".