To keep your teenagers safe while they use a cellphone, computer etc you can install tracking software and other spy apps on the teenagers cellphone.
Those spy apps and tracking software can help you know what they are doing and where the teenager might be with their cellphone.
Also you should block websites that may be deemed unsafe on your internet router and check up on what your teen is doing on their computer.
Teach the teenager to never meet up with strangers as there have been teens abducted when they met through Facebook and other social websites.
You have to get to know the person first and meet in a public place when you do meet up but you should never meet up with them when they are a teen.
Tracking Software for cellphones can help track what your teenager or kid is doing on the phone and can help locate the teens or child's whereabouts.
The Tracking software for the cellphone can help in those instances and can literally be a lifesaver for your teenager or child in the event they are lost, abducted etc.
Some parents also use the cellphone tracking software and other apps to spy on the teens or child's text messages, phone calls and even the photos they may have on their phones.
I would not spy too much on my own teenagers phone but I would sure love to know that they are using the cellphone safely and not making contact with some potential predator or they are not out somewhere they should not be.
Cellphone Tracking Software though should not be used to spy on someone to stalk them though but when used legally and legit the cellphone tracking software and other spy apps are good to have.