Although human movement and mobility patterns have a high degree of freedom and variation, they also exhibit structural patterns due to geographic and social constraints. Using cell phone location data, as well as data from two online location based social networks, Cho et al. [12] aim to understand the basic laws that govern human motion and dynamics. It is found that humans experience a combination of strong short-range spatially and temporally periodic movement that is not impacted by the social network structure, while long-distance travel is more influenced by the social network ties. Furthermore, it is shown that social relationships can explain about 10 to 30 percent of all human movement, while periodic behavior explains 50 to 70 percent. Based on these findings, a model of human mobility is proposed that combines periodic short-range movements with travel due to the social network structure and gives an order of magnitude better performance than previous models.