Google has finally included a placement exclusion list in AdWords.
It is in the left hand side navigation panel and called “Shared Library.”
It has also incorporated list suggestions into the interface to help predict where you would like the same exclusions to go across your campaigns.
These placement exclusion lists allows the user to create lists of sites they do not want their ad to appear on, they then can use that same list across their campaigns.
Google will help suggest where else you could use the shared list across all your campaigns.
This new tweak in the AdWords interface will help create a much easier and streamlined way to manage your account.