The graph looks like a timeline while it isn't. I don't know what's the number in the peak point. What does some point in the middle of the line between f.ex. tv and newspapers represent?

It's silly and confusing.

So, rendering the graph as a bar set with proper numbering and perhaps a detailed legend would convey the information just as well and avoid confusion as to what points between "Movies" and "Books" mean (although that very question has a very elementary one-word answer followed by a look of ever-so-slight amusement).

Still far from worst graph of the decade. For an example of a worse and far more hilarious case, over the top of my head: http://www.mydailyroast.com/?p=311

Have a nice day.

Is 'Nothing' the one word answer?

I think so, but the graph is so bad (allegedly) that I can't be entirely certain (apparently). /sarcasm