Powerful image of the 1918 flu epidemic. Can you imagine this happening today? I hope not. In this connected world, where we can check our symptoms online, know when facebook friends are nearby, and tweet that our kids are sick, it is only a matter of time before all would-be epidemics are recognized early through analysis of social networks. The US government is even sponsoring a challenge in this exact area. Ubiquitous health monitoring devices will take early detection to a higher, more reliable level, toward a world of epidemics no more.