Cary, NC company BlogAds has long been the favorite ad network with progressive blogs such as Daily Kos and their Advertise Liberally niche network. BlogAds has grown with other niches like music and celebrity gossip blog networks.

Of late, many blogs on the Advertise Liberally niche have been unhappy with the lack of growth in terms of revenue. Some small to medium sites have seen zero revenue for months from BlogAds while the Big Ten always seem to be running full.

Enter Click To Blue. CTB is a new ad network whose ad inventory zones are on pre-approved sites that have progressive political content. Early adopters from Advertising Liberally have seen tremendous revenue growth compare to BlogAds.

Running on OpenX, an open source online ad network software package, Click To Blue is opening up a new frontier in ad networks - small, invitation-only, and niche focused.