Hello, i am triying to optimise my adsense account, i want to ask if is possible to choose the category to display advertisement on websites, i don't mean only to show text or not. One of my website is about photography, and really i don't want to display something with my competitors to promote them. I want in this website to be shown only generics categories, it's possible? I have tried with allow/block, but it says categories are too big to change them. Please help me with this.:confused: