Koreans Vs. Virus

"South Koreans are using smartphone apps to avoid the novel coronavirus":

Recently developed apps using public government data allow users to see how close they are to where a confirmed Covid-19 patient has been. They can also see the date a patient was confirmed with the disease, demographic data about the patient, and, crucially, some of their location history.

At least one app, called Corona 100m, will also alert a user if they come within 100 m (328 ft) of a location visited by someone who’s had Covid-19.

Developers of such offerings have seen a surge in downloads...