Teen Tracking Apps - Good or Bad?

I never heard of teen tracking apps, that I remember. I can see why some parents would want to use them. Not sure if I would or not. Would you?

http://www.usatoday.com/story/tech/personal/2014/…

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8Theresa GouldChicago, Illinois
About Theresa Gould
Current: Chicago, Illinois
Birth: August 10
On Moms.com since: Aug 5, 2013
***Baby Team Leader Moms.com*** I have been married for over 20 years. My husband and I have eight children ages 18 down to 4 years old. We use to live in Chicago but now live in Canada. I own www.FaithandFamilyReviews.com.