Snapchat's "track your friends" feature will help millions of people recognize how much portable phones track them for companies and governments.

The author made an excuse to put the issue out of mind, but people can also learn to organize to put an end to this.

Even a non-"smart" phone is tracked by the phone company and the state, all the time it is "on". (And it may be "on" all the time if it was modified remotely to do listen.)