Quantified Self

In the Economist:  The trend of using technology to track your own health and then using social technology to compare data.   Good piece describing the trend.  I think it can improve the quality of your life.  But I think it also requires the insertion of expertise, both medical and data,  to help you understand what you record. Health analytics.    I also think that it requires a special and somewhat unusual person who is willing to do the kind of recording and honest introspection that is required.