In Chapter 1 I write about tracking influenza using Google search. Here is an interesting item from the BBC about tracking diseases using social media such as Twitter. I had always thought that tracking illnesses such as influenza was an interesting but not very useful activity: all you really need to know is that there is an outbreak and you need to take sensible precautions. However, I guess this work is vitally important in providing the tools necessary to quickly establish an outbreak or tracking something very serious. What do you think?