Google Latitude used to do this but it has since been shutdown. If you're on Android, check out https://play.google.com/store/apps/details?id=gaugler.backitude&

Google Latitude used to do this but it has since been shutdown. If you're on Android, check out https://play.google.com/store/apps/details?id=gaugler.backitude&hl=en https://play.google.com/store/apps/details?id=gaugler.backit...