I. Introduction
With the explosion of social media data, health scientists have become more engaged in using computational modeling to better understand health and health behavior. Indeed, Pentland et al. have note that daily use of technology “leave digital breadcrumbs - tiny records of our daily experiences” that when mined and analyzed can provide insight into health behavior and health outcomes [26]. Similarly, a number of researchers have been advocating the value of online data in understanding public health problems and their determinants (e.g., see [17], [10], [15], [5], [21], [23], [24], [8]). It is clear that computer science expertise is critical to the collection and analysis of the associated data [29].