Website is a kind of media, Social Media Platform (Facebook, Twitter) is a kind of media, Mobile App (iPhone, Android Apps) is a kind of media. Media can be seen as promotion channels (or sometimes sales channels) of a company. Putting your company / products into multi-channels helps your company to get exposed to a larger number of audiences. So you may have larger sales volume. But of course, the channels have be managed well or the brand will go bad.

Messages delivered in each channel have to be consistent but it does not necessarily be all the same. So, if all the channels are managed well and inter-connected, MAYBE THIS IS "INTERMEDIA".

Thanks for your question!