How Does Social Networking Influence the Spread of Diseases?

For nearly a century, actually, the assumption has been that everything spreads just like a virus does. And so we can think about this epidemological model, the spread of diseases, as an underlying guide for thinking about all kinds of spreading processes. So it's very appealing to think that most things spread like viruses, you know. But let's just drill down her second deeper. Let's look at the social networks that allow afvires to spread expodentially.