Lets just say I have a site that has a blog built onto it. example boringsite.com/blog1 But I want to mask the url to something more seo friendly. example myawesomeblog.com How do I keep the big G from penalizing me for my own duplicate content, putting my masked domain and my main site in competition with each other? Someone said something about messing with the robot.txt, but I don't know about that. Any way I can only let the big G see myawesomeblog.com , and not boringsite.com/blog1 ?