The resonance media will not exchange anything. It will create a new emotion, that is change the prevailing emotional space. Emotion is a resonance of various feelings. But too many feelings cannot create themselves into a good resonance. Be careful of a 'powerful' resonance because it should be fabricated by integrating variety of feelings of numerous persons into a monotonous feeling, 'resentiment'.
Mass media is a device to fabricate 'resenmtiment'.
The resonance cannot take place in too large radius of feelings. If communicative community does matter, the resonance must decide the size of community. In the age of satellite and internet, every local medium has to be potentially global. Sender and receiver can be separated only in a theoretical abstraction and a forced operation in the power system. Sender and receiver should get together.