MediaBrix has introduced responsive design functionality to its in-app ad units.
This leverages HTML5 and CSS3 to create full-screen experiences, featuring video content and social sharing, which will be automatically formatted to fit the device being used.
“What makes our vision and model work for developers and advertisers is that we provide users with seamless, immersive, interactive brand experiences that are non-disruptive,” said Ari Brandt, MediaBrix CEO and co-founder. “Our latest innovation is another way to make sure user experiences with brands stay positive and consistent, no matter what device that user is on.” 
According to MediaBrix, this is a first – previously, its been down to individual developers to introduce responsive design to their apps.
