What ad companies MyLikes (Likes) using?

I am trying to figure out with no success. Can anyone please help me with this?
Website: http://likes.com
I think he only use ads for us/can/aus/uk

Thanks!

They use DoubleClick, or the Google ad exchange. This basically means they use ads from many ad networks, but the ad exchange is a real time bidding system that basically earns you the most for your ad space...