Here is a very interesting mind map I found on the web: It has been drawn by Walt Disney himself, to picture his whole idea of the industry he will create, back in 1957. You can clearly see how everything is linked, to create the magic of Disney we all know.
Walt Disney understood perfectly how all the existing media were working, and get the best out of them (TV, movie theater, music...). It would have been fun to see how he would have used social media. By the way, I think that Disney is the strongest brand on social media nowadays.