It is necessary to grasp and utilize consumer's needs for firms to improve existing products and developing new products. Especially, collaboration with consumers for product innovation is indispensable. On the other hand, social media has been spreading all over the world. Network communities...

The recent growth of consumer-generated media (CGM), also known as “new” media, has changed the nature of interaction between consumers and firms from unidirectional to bidirectional. However, CGM are almost always present alongside traditional media such as TV advertising. This research...