Top Publishers Knowing the top publishers helps advertisers to dupli- cate their success in the online space. Accordingly, most of the popular publisher domains that serve the majority of healthcare ads are primarily niche domains. They are dedicated to delivering ads to the healthcare audience and are, therefore, more advantageous for advertisers in the healthcare niche. For example, www.drugs.com, www.healthboards. com, and allnurses.com — three of top publisher do- mains. Together, the top ten publishers account for 22800 ads or about 16% percent of all the ads served on 7000+ publisher domains. TOP