A friend of mine posted this link on Facebook, and I saw it during our class break on Tuesday night. It's a great complement to the discussion we'd had in class about the changes in mass communications historically, and it's quite attractive for those of us who appreciate visual display of information!
I found it interesting that it's called "history of content." It seems to me that it's very much about the media and distribution, not the content. (Although the subhead explains much better that it's about the history of circulation and consumption.)
Enjoy. (Click on it to zoom in.)