Advertising not only influences content, it influences the perception of content. If you see a "Wikipedia is brought to you today by McDonalds..." banner and th

Advertising not only influences content, it influences the perception of content. If you see a "Wikipedia is brought to you today by McDonalds..." banner and then read the entry on McDonalds, a presumably intelligent reader without extensive knowledge of the inner workings of Wikipedia might wonder if there's some kind of editorial influence on the content.