Demographic targeting

One of the largest ad networks in the world. They do CPM buys only.

An ad network comprised on Yahoo sites, the former Blue Lithium's sites and the former Right Media's sites. Their value prop is a dynamic CPM tied to a CPA goal and a real-time optimization system.

Can do demographic targeting.

One of the larger ad networks but runs media only on a CPM basis. They are an ad exchange, so they purchase media from other networks.

The biggest ad network in the world, which also includes AOL. Like other large ad networks, they can run media on a CPM, CPC or CPA but since it all runs on the same network, if you do a performance deal with them, volume can fluctuate significantly.