Many Webmasters make a mistake by building huge number of backlinks aimlessly knowing on what URL they are building links on .Hope you arent one of those? Every webmaster should Learn about the canonical urls of their blog and manage them . Dont worry , i have already written a post which tells you exactly what to do . http://blognseo.com/managing-canonical-urls-wordpress-blog/ I will provide support here for those who didnt understand how to manage URLs.