I got a PM today which i couldnt answer. In Placement targeting you have your list of URLs where you specifiy on what sites your ads to show? Does the number of URLs there affect nr. of impressions...or effectivity of ads? Would it be better to decrease or increase the number of sites? G.
Increasing the Urls will increase your exposure of your Ad in various websites, however if your budget is low then it does not help... it depends on your objective if you have limited bugdet you can get great no of impression on single Url....