Searchengineman, a PPC specialist, asked in a Google AdWords Help thread if it is possible to place the same remarketing tags on multiple websites. The answer is yes.
Remarketing is part of Google's display network, allowing advertisers to show display as to users based on web sites they've visited. You can learn more about Google's remarketing over here.
The question was can a site who has 50 or so affiliates enable those affiliates to add their remarketing tag code to their sites. Google said it is allowed. The response from a Google remarketing engineer was:
We generally don't regulate where the remarketing code goes, since the very fact of you being able to install the code on a site suggests that you are the owner of or at least affiliated with the website in question. So the next steps for you would be to create an account for your central corporate campaign and then create an audience list, and then ask all your franchisees to put that generated code on each of their sites. Visitors to all of these sites will then be added to the same audience list. Then you can set up a remarketing campaign in this new account to target the list, and ads will begin to show one you hit the requisite 100 users.
Hope this helps others.
Forum discussion at Google AdWords Help.
