Let's look at three companies from our list of As. Adnetik is a standard targeting company that uses real-time bidding. They can offer targeted ads based on how users act (behavioral), who they are (demographic), where they live (geographic), and who they seem like online (lookalike), as well as something they call "social proximity." They also give advertisers the ability to choose the types of sites on which their ads will run based on "parameters like publisher brand equity, contextual relevance to the advertiser, brand safety, level of ad clutter and content quality."