1. Yahoo! / Bing Contextual Ad Network
Media.net is a contextual ad network run by a partnership between Yahoo! and Bing, two of Google’s biggest competitors. It functions in generally the same way as AdSense, and offers many of the same options. This ad network provides standard ad sizes (e.g., 728×90, 300×250, etc.) as well as contextual link units that direct to “landing pages” of targeted ads.
Infolinks is a provider of so called “smart ads,” with their most common solution involving the display of ads when users hover their mouse over linked content. Infolinks also offers “skinned” ads that fit in the empty space to the right and left of a site’s content, as well as text links that can be inserted within content.
Outbrain is an ad network that generally has publishers on both sides of the payment equation. They’re responsible for many of the “sponsored content” sections around the web, in which publishers pay to have links to their content featured on other sites. When these links are clicked, the referring site earns some revenue while the destination site gets a new visitor.
Outbrain ads are generally pretty far down on the page, and as such won’t earn nearly as much as traditional ad units placed above the fold. But they can be an effective way to generate incremental ad revenue from visitors who would otherwise leave the site once they’ve finished consuming a piece of content.