Systematically exposing the information that you were at place X at time Y is already a huge privacy violation. You can bet it will not only be used for that (i

Systematically exposing the information that you were at place X at time Y is already a huge privacy violation. You can bet it will not only be used for that (immediately dispatching police forces) but in due time it will become the norm for countless other “less harmful” uses in the interest of whoever controls the apparatus (government, lobbies, industry): collection agencies, private investigators, myriad profiling ventures, and yes, advertising. We’ve been warned.