According to researchers, the time a person spends on different smartphone apps is enough to identify them from a larger group in more than one in three cases.
Snapchat will introduce real-time location sharing, meant to be used as a temporary buddy system, for example, while friends and family are en route to a date or headed home.
Fitness apps that emphasize illness- or death-related messaging are more likely to be effective in motivating participation than are social stigma, obesity, or financial cost messaging.
