Can you guys list all of the types of businesses that make up internet advertising? For example, there are ad development companies, ad serving companies, performance-based marketing companies, etc.
There are all sorts of different types of companies. It depends on how specifically you want to categorize them.
There cannot be too many types of businesses to list within internet advertising. I don't think I'm posing the question right. There are agencies, marketers, and publishers. There are ad-serving companies, like DoubleClick. What kinds of categories were you guys thinking of?