Advances in medical science allow people to live longer and more independently
than some decades ago. However, this does not directly help older adults
improve their mental wellbeing. Several studies show that elderly people
usually suffer from some level of social isolation that negatively impacts on
their physical and mental conditions. As a way to address such a problem, this
paper presents Visitrack, a pervasive and unobtrusive service conceived to
monitor the social activity of older adults living at home. Based on sensing
data retrieved and processed by the system, it can take several actions. For
instance, informing gamily members and friends about long periods with no
social activity at the older adult's home. The proposed service has been
evaluated through a controlled experimental study, obtaining highly accurate
results.