Snapchat recently introduced a new tracker in its most current update. This tracker allows you to view the exact location of your friends. It can give you their current area, town, street and if you zoom in enough, it shows the house on the street layout.
If you or your children use Snapchat, please check to ensure the location set to Ghost mode, that way no one can see where you are.
To do this, make sure you have the updated version of the app, go to selfie mode on the camera, then zoom out. It will give you the option of changing who can see your location.