Just a small reference towards your question, "People don't hit the Digg button without reading the story, right?" I remember reading this MIT Technology Review: Do Digg Users Read Past the Headlines? article, which in some ways may go towards answering your question, it appears people don't even get past the headline. The comments on the Digg page of this article also makes very interesting reading.
All Comments
Technology Review: Do Digg Users Read Past the Headlines?
article, which in some ways may go towards answering your question, it
appears people don't even get past the headline. The comments
on the Digg page of this article also makes very interesting reading.