Ahh, a plague story. I have a real problem with this story, both in how it spreads and how it affects (or doesn't affect) people. The paintings seem to have one of two possible effects on people. Most people, like the narrator and Kara, they mesmerise into coma and eventual death. Other people, like Jer, they make unable to understand that when they show paintings to people and their eyes glaze over and they become non-responsive to everything until they are no longer looking at the paintings and that there is anything wrong with this. By his own admission the narrator doesn't seem to try particularly hard to explain to Jer what's happened but it does seem as if he is so thick that he has to be kept away from sharp objects in case he tries to scratch his own brain with them.
So Jeremy emails them to people and those on his friends list that aren't affected nevertheless feel it necessary to spread them around? I'm not sure why the narrator feels it necessary to commit suicide-by-painting at the end, it's not like a lot of people on the planet use the Internet, so the worst case scenario is probably that it takes out a chunk of civilisation and them, combined with the people who don't have email, can probably rebuild the world without too much difficulty.
Worst plague evar.
That said, I didn't dislike the story as much as the above suggests. It was okay and I would certainly listen to more stories by the author in future.